Definition of frontier in English:

frontier

noun ˈfrʌntɪəfrʌnˈtɪəˌfrənˈtɪr

1A line or border separating two countries.
边境，边界
international crime knows no frontiers
France's frontier with Belgium
figurative the frontier between thought and reality is confused
as modifier an end to frontier controls
Example sentencesExamples
- From the village of Barqueiros about 70 km / 40 miles upstream from Oporto, the region fans out either side of the river stretching as far as the frontier with Spain.
- The man at the centre of the puzzle was born in Torquay in 1867 and first fell in love with South America when he helped the Bolivian government to survey its frontier with Brazil.
- This frontier with Belarus was now set to become the eastern frontier of Nato itself.
- The German concentration against France had left only one army to defend the eastern frontier.
- Under his leadership in the 1840s, the Swazis expanded their territory to the Northwest and stabilized the southern frontier with the Zulus.
- The waterway has its source in western Zambia, forming the frontier between Zimbabwe and Zambia and passing through central Mozambique before it empties into the Indian Ocean.
- From Basle to Haguenau, the River Rhine acted as the frontier between Germany and France - and also as a very formidable defensive barrier.
- Hundreds of thousands more are believed to be waiting on the Afghan side of the frontier with no shelter and little food.
- He dreamed of being part of this growing nation, of helping expand its frontiers.
- The city is semicircled by the Sar Mountains and surmounted by an old Turkish fortress; the mountains are the frontier with Albania and Kosovo.
- The North Korean capital, Pyongyang, was captured a month later, and the UN forces advanced towards the frontier with China.
- In the main agreement, Germany recognized its frontier with France and Belgium as specified in the Treaty of Versailles, along with the demilitarized status of the Rhineland.
- At the time the Russians said he had been shot by a border guard while crossing the frontier with Finland.
- Its function remains uncertain: it may have been conceived as a defensible barrier, or, more probably, as a well-defined frontier between two countries.
- Two border guards patrolling the nearby frontier with Georgia have also been reported missing since Friday night.
- The frontier between India and Pakistan ran through the Sikh homeland of the Punjab.
- Finally, in the spring of 1860 he sent the bulk of his army north to protect the frontier with the Papal States.
- Polish border police fighting smugglers of people, drugs, tobacco, nuclear material and weapons are employing American Indian trackers to guard the frontier with Ukraine.
- The high Andes peaks constitute its natural frontier with Bolivia and Argentina.
- Their reactors and weapons stockpiles are vulnerable, their frontiers are poorly controlled and key segments of their security services are often corrupt.
Synonyms
border, boundary, partition, borderline, dividing line, bounding line, demarcation line
perimeter, limit, edge, rim
marches, bounds
1. 1.1 The extreme limit of settled land beyond which lies wilderness, especially in reference to the western US before Pacific settlement.
  （靠近荒野的定居地的）边缘地带，边远地区，边疆（尤指美国人在太平洋沿岸定居之前的西部）
  his novel of the American frontier
  他写的关于美国西部边疆开拓的小说。
  Example sentencesExamples
  During this era of settlement of the prairie and western frontiers, a belief in the inevitability of white men's dominance of the landscape was prevalent.
  Hard country tends to bring out a frontier mentality in its settlers, and there's not much evidence of concern for the environment in Arizona.
  We have always said that our story is like the story of the frontier towns and the hinterland outposts.
  Americans saw little value in pushing this new frontier any further at the time.
  But perhaps it would be fairer to suggest that it was the frontier that failed the settlers.
  The farther west the preachers and padres rode the less evidence they found of Christianity, not just in the rail towns but also in the frontier settlements a day's ride from the depots.
  The frontier mentality of moving on to fresh ground remains deeply embedded in the American psyche.
  Settling the American frontier was a matter of private choice, as were decisions about moving on.
  Many times public houses were the first erected structures around which frontier towns grew.
  I give more credit to the nameless women who settled the frontier and thus earned the right to vote in western states.
  For years, all was quiet as the Western frontier was slowly settled by a trickle of pioneers.
  Differing colonial experiences and the settlement of the western frontier created strong and persistent regional political interests.
  The frontier mentality and adversarial roles are being replaced with new models of sustainability.
  Until the 1890s, the black regiments served almost entirely at remote western frontier posts.
  Like many frontier outposts, Tombstone was a town divided.
  After the reductions following that war, the Army returned to its frontier outposts.
  Now, the only Americana to die a more romantic cinematic death was the frontier in Westerns from the '70s.
  Tom Cruise and Nicole Kidman star as two hapless criminals who embark on a land rush on the western frontier.
  The great slogan of the settlement of the western frontier during the middle parts of the 19th century was Get in, Get Rich, Get Out.
  Attempts by the British to restrict further expansion into the western frontier constituted one of the factors contributing to the Revolution.
2. 1.2 The extreme limit of understanding or achievement in a particular area.
  （某一学科）的知识（或成就）边缘，前沿，新领域
  the success of science in extending the frontiers of knowledge
  科学在开拓知识新领域方面所取得的成功。
  Example sentencesExamples
  Those looking to push out the frontiers of our scientific understanding will be disappointed.
  As a result they have pushed forward the frontiers of animal science and human medicine.
  The production possibility frontier has been all but shattered with innovation and continuous improvement.
  This will change in the future as oceanic islands become more accessible and better known, but at present, for many Earth scientists, they remain at the frontiers of understanding.
  Science is hardly dead; as Laughlin says, the focus has merely shifted to different areas, pushing different frontiers with different tools in different quests.
  We want to bring our students as quickly as possible to the frontier of current understanding.
  The upper part of Figure 8.1 shows the production possibility frontiers for the UK and USA.
  No, I just consider it pushing back the frontiers of Computing Science.
  I'm interested in expanding the frontiers of real-world liberty, not spinning Utopias.
  His research has begun to make progress in this area, expanding the frontier of visual neuroscience to the field of decision-making and cognitive neuroscience.
  The banks have been pushing back the frontiers by launching ever more innovative and competitive loans.
  The trick is to extend the frontiers of devolved responsibility, without falling over the edge into separatism.
  But a few intrepid researchers are still pushing back the frontiers on this most mundane of molecules.
  It embodies a set of policies aimed at pushing back the frontiers of poverty, while supporting growth and creating opportunities.
  This is extremely four-square stuff, even by the standards of an artist never renowned for pushing back the frontiers of avant-garde sonic exploration.
  Space telescopes and other space-based cosmological experiments are pushing back the frontiers of knowledge about the fundamental laws and history of the universe.
  Space exploration and exploitation is a major driving force in advancing the frontiers of knowledge.
  For years, astronomers have been slowly pushing back the frontiers of the observable universe - looking further and further away in terms of distance, and further and further back in time.
  NASA is constantly reaching to cross the frontiers of human knowledge and understanding.
  He noted the relevance of science and technology ‘to the struggle for development and pushing back the frontiers of poverty and underdevelopment’.
  Synonyms
  limit, end, edge, side, farthest point, boundary, border, boundary line, bound, bounding line, partition line, demarcation line, end point, cut-off point, termination

Derivatives

frontierless

adjective

Also discussed at length in the article is the frontierless character of the internet and its implications.
Example sentencesExamples
- We need space exploration; without it, we heirs of Western civilization risk becoming a frontierless folk culture engaged in endless self-reflection.
- It was a place without any clear dimensions: a frontierless tract of land steeped in history.
- However, this collaboration occurs in a frontierless economy, thanks largely to modern Internet technology.
- On the other hand, the need to join with competent partners to face the present frontierless world requires a connection with those sharing the same fundamental interests.

Origin

Late Middle English: from Old French frontiere, based on Latin frons, front- 'front'.

Definition of frontier in US English:

frontier

nounˌfrənˈtirˌfrənˈtɪr

1A line or border separating two countries.
边境，边界
Example sentencesExamples
- The man at the centre of the puzzle was born in Torquay in 1867 and first fell in love with South America when he helped the Bolivian government to survey its frontier with Brazil.
- From the village of Barqueiros about 70 km / 40 miles upstream from Oporto, the region fans out either side of the river stretching as far as the frontier with Spain.
- From Basle to Haguenau, the River Rhine acted as the frontier between Germany and France - and also as a very formidable defensive barrier.
- At the time the Russians said he had been shot by a border guard while crossing the frontier with Finland.
- He dreamed of being part of this growing nation, of helping expand its frontiers.
- Two border guards patrolling the nearby frontier with Georgia have also been reported missing since Friday night.
- The North Korean capital, Pyongyang, was captured a month later, and the UN forces advanced towards the frontier with China.
- Polish border police fighting smugglers of people, drugs, tobacco, nuclear material and weapons are employing American Indian trackers to guard the frontier with Ukraine.
- The high Andes peaks constitute its natural frontier with Bolivia and Argentina.
- This frontier with Belarus was now set to become the eastern frontier of Nato itself.
- Finally, in the spring of 1860 he sent the bulk of his army north to protect the frontier with the Papal States.
- Its function remains uncertain: it may have been conceived as a defensible barrier, or, more probably, as a well-defined frontier between two countries.
- Their reactors and weapons stockpiles are vulnerable, their frontiers are poorly controlled and key segments of their security services are often corrupt.
- Under his leadership in the 1840s, the Swazis expanded their territory to the Northwest and stabilized the southern frontier with the Zulus.
- The city is semicircled by the Sar Mountains and surmounted by an old Turkish fortress; the mountains are the frontier with Albania and Kosovo.
- The German concentration against France had left only one army to defend the eastern frontier.
- The frontier between India and Pakistan ran through the Sikh homeland of the Punjab.
- The waterway has its source in western Zambia, forming the frontier between Zimbabwe and Zambia and passing through central Mozambique before it empties into the Indian Ocean.
- In the main agreement, Germany recognized its frontier with France and Belgium as specified in the Treaty of Versailles, along with the demilitarized status of the Rhineland.
- Hundreds of thousands more are believed to be waiting on the Afghan side of the frontier with no shelter and little food.
Synonyms
border, boundary, partition, borderline, dividing line, bounding line, demarcation line
1. 1.1 The extreme limit of settled land beyond which lies wilderness, especially referring to the western US before Pacific settlement.
  （靠近荒野的定居地的）边缘地带，边远地区，边疆（尤指美国人在太平洋沿岸定居之前的西部）
  his novel of the American frontier
  他写的关于美国西部边疆开拓的小说。
  Example sentencesExamples
  I give more credit to the nameless women who settled the frontier and thus earned the right to vote in western states.
  Until the 1890s, the black regiments served almost entirely at remote western frontier posts.
  We have always said that our story is like the story of the frontier towns and the hinterland outposts.
  The great slogan of the settlement of the western frontier during the middle parts of the 19th century was Get in, Get Rich, Get Out.
  Attempts by the British to restrict further expansion into the western frontier constituted one of the factors contributing to the Revolution.
  Settling the American frontier was a matter of private choice, as were decisions about moving on.
  Many times public houses were the first erected structures around which frontier towns grew.
  But perhaps it would be fairer to suggest that it was the frontier that failed the settlers.
  The frontier mentality and adversarial roles are being replaced with new models of sustainability.
  Tom Cruise and Nicole Kidman star as two hapless criminals who embark on a land rush on the western frontier.
  Differing colonial experiences and the settlement of the western frontier created strong and persistent regional political interests.
  The farther west the preachers and padres rode the less evidence they found of Christianity, not just in the rail towns but also in the frontier settlements a day's ride from the depots.
  The frontier mentality of moving on to fresh ground remains deeply embedded in the American psyche.
  Hard country tends to bring out a frontier mentality in its settlers, and there's not much evidence of concern for the environment in Arizona.
  For years, all was quiet as the Western frontier was slowly settled by a trickle of pioneers.
  Like many frontier outposts, Tombstone was a town divided.
  During this era of settlement of the prairie and western frontiers, a belief in the inevitability of white men's dominance of the landscape was prevalent.
  Americans saw little value in pushing this new frontier any further at the time.
  Now, the only Americana to die a more romantic cinematic death was the frontier in Westerns from the '70s.
  After the reductions following that war, the Army returned to its frontier outposts.
2. 1.2 The extreme limit of understanding or achievement in a particular area.
  （某一学科）的知识（或成就）边缘，前沿，新领域
  the success of science in extending the frontiers of knowledge
  科学在开拓知识新领域方面所取得的成功。
  Example sentencesExamples
  But a few intrepid researchers are still pushing back the frontiers on this most mundane of molecules.
  The upper part of Figure 8.1 shows the production possibility frontiers for the UK and USA.
  For years, astronomers have been slowly pushing back the frontiers of the observable universe - looking further and further away in terms of distance, and further and further back in time.
  The production possibility frontier has been all but shattered with innovation and continuous improvement.
  I'm interested in expanding the frontiers of real-world liberty, not spinning Utopias.
  This will change in the future as oceanic islands become more accessible and better known, but at present, for many Earth scientists, they remain at the frontiers of understanding.
  This is extremely four-square stuff, even by the standards of an artist never renowned for pushing back the frontiers of avant-garde sonic exploration.
  Science is hardly dead; as Laughlin says, the focus has merely shifted to different areas, pushing different frontiers with different tools in different quests.
  His research has begun to make progress in this area, expanding the frontier of visual neuroscience to the field of decision-making and cognitive neuroscience.
  Space exploration and exploitation is a major driving force in advancing the frontiers of knowledge.
  Those looking to push out the frontiers of our scientific understanding will be disappointed.
  It embodies a set of policies aimed at pushing back the frontiers of poverty, while supporting growth and creating opportunities.
  The banks have been pushing back the frontiers by launching ever more innovative and competitive loans.
  Space telescopes and other space-based cosmological experiments are pushing back the frontiers of knowledge about the fundamental laws and history of the universe.
  NASA is constantly reaching to cross the frontiers of human knowledge and understanding.
  He noted the relevance of science and technology ‘to the struggle for development and pushing back the frontiers of poverty and underdevelopment’.
  No, I just consider it pushing back the frontiers of Computing Science.
  The trick is to extend the frontiers of devolved responsibility, without falling over the edge into separatism.
  As a result they have pushed forward the frontiers of animal science and human medicine.
  We want to bring our students as quickly as possible to the frontier of current understanding.
  Synonyms
  limit, end, edge, side, farthest point, boundary, border, boundary line, bound, bounding line, partition line, demarcation line, end point, cut-off point, termination

Origin

Late Middle English: from Old French frontiere, based on Latin frons, front- ‘front’.

词汇	frontier
释义	Definition of frontier in English: frontier noun ˈfrʌntɪəfrʌnˈtɪəˌfrənˈtɪr 1A line or border separating two countries. 边境，边界 international crime knows no frontiers France's frontier with Belgium figurative the frontier between thought and reality is confused as modifier an end to frontier controls Example sentencesExamples From the village of Barqueiros about 70 km / 40 miles upstream from Oporto, the region fans out either side of the river stretching as far as the frontier with Spain. The man at the centre of the puzzle was born in Torquay in 1867 and first fell in love with South America when he helped the Bolivian government to survey its frontier with Brazil. This frontier with Belarus was now set to become the eastern frontier of Nato itself. The German concentration against France had left only one army to defend the eastern frontier. Under his leadership in the 1840s, the Swazis expanded their territory to the Northwest and stabilized the southern frontier with the Zulus. The waterway has its source in western Zambia, forming the frontier between Zimbabwe and Zambia and passing through central Mozambique before it empties into the Indian Ocean. From Basle to Haguenau, the River Rhine acted as the frontier between Germany and France - and also as a very formidable defensive barrier. Hundreds of thousands more are believed to be waiting on the Afghan side of the frontier with no shelter and little food. He dreamed of being part of this growing nation, of helping expand its frontiers. The city is semicircled by the Sar Mountains and surmounted by an old Turkish fortress; the mountains are the frontier with Albania and Kosovo. The North Korean capital, Pyongyang, was captured a month later, and the UN forces advanced towards the frontier with China. In the main agreement, Germany recognized its frontier with France and Belgium as specified in the Treaty of Versailles, along with the demilitarized status of the Rhineland. At the time the Russians said he had been shot by a border guard while crossing the frontier with Finland. Its function remains uncertain: it may have been conceived as a defensible barrier, or, more probably, as a well-defined frontier between two countries. Two border guards patrolling the nearby frontier with Georgia have also been reported missing since Friday night. The frontier between India and Pakistan ran through the Sikh homeland of the Punjab. Finally, in the spring of 1860 he sent the bulk of his army north to protect the frontier with the Papal States. Polish border police fighting smugglers of people, drugs, tobacco, nuclear material and weapons are employing American Indian trackers to guard the frontier with Ukraine. The high Andes peaks constitute its natural frontier with Bolivia and Argentina. Their reactors and weapons stockpiles are vulnerable, their frontiers are poorly controlled and key segments of their security services are often corrupt. Synonyms border, boundary, partition, borderline, dividing line, bounding line, demarcation line perimeter, limit, edge, rim marches, bounds 1.1 The extreme limit of settled land beyond which lies wilderness, especially in reference to the western US before Pacific settlement. （靠近荒野的定居地的）边缘地带，边远地区，边疆（尤指美国人在太平洋沿岸定居之前的西部） his novel of the American frontier 他写的关于美国西部边疆开拓的小说。 Example sentencesExamples During this era of settlement of the prairie and western frontiers, a belief in the inevitability of white men's dominance of the landscape was prevalent. Hard country tends to bring out a frontier mentality in its settlers, and there's not much evidence of concern for the environment in Arizona. We have always said that our story is like the story of the frontier towns and the hinterland outposts. Americans saw little value in pushing this new frontier any further at the time. But perhaps it would be fairer to suggest that it was the frontier that failed the settlers. The farther west the preachers and padres rode the less evidence they found of Christianity, not just in the rail towns but also in the frontier settlements a day's ride from the depots. The frontier mentality of moving on to fresh ground remains deeply embedded in the American psyche. Settling the American frontier was a matter of private choice, as were decisions about moving on. Many times public houses were the first erected structures around which frontier towns grew. I give more credit to the nameless women who settled the frontier and thus earned the right to vote in western states. For years, all was quiet as the Western frontier was slowly settled by a trickle of pioneers. Differing colonial experiences and the settlement of the western frontier created strong and persistent regional political interests. The frontier mentality and adversarial roles are being replaced with new models of sustainability. Until the 1890s, the black regiments served almost entirely at remote western frontier posts. Like many frontier outposts, Tombstone was a town divided. After the reductions following that war, the Army returned to its frontier outposts. Now, the only Americana to die a more romantic cinematic death was the frontier in Westerns from the '70s. Tom Cruise and Nicole Kidman star as two hapless criminals who embark on a land rush on the western frontier. The great slogan of the settlement of the western frontier during the middle parts of the 19th century was Get in, Get Rich, Get Out. Attempts by the British to restrict further expansion into the western frontier constituted one of the factors contributing to the Revolution. 1.2 The extreme limit of understanding or achievement in a particular area. （某一学科）的知识（或成就）边缘，前沿，新领域 the success of science in extending the frontiers of knowledge 科学在开拓知识新领域方面所取得的成功。 Example sentencesExamples Those looking to push out the frontiers of our scientific understanding will be disappointed. As a result they have pushed forward the frontiers of animal science and human medicine. The production possibility frontier has been all but shattered with innovation and continuous improvement. This will change in the future as oceanic islands become more accessible and better known, but at present, for many Earth scientists, they remain at the frontiers of understanding. Science is hardly dead; as Laughlin says, the focus has merely shifted to different areas, pushing different frontiers with different tools in different quests. We want to bring our students as quickly as possible to the frontier of current understanding. The upper part of Figure 8.1 shows the production possibility frontiers for the UK and USA. No, I just consider it pushing back the frontiers of Computing Science. I'm interested in expanding the frontiers of real-world liberty, not spinning Utopias. His research has begun to make progress in this area, expanding the frontier of visual neuroscience to the field of decision-making and cognitive neuroscience. The banks have been pushing back the frontiers by launching ever more innovative and competitive loans. The trick is to extend the frontiers of devolved responsibility, without falling over the edge into separatism. But a few intrepid researchers are still pushing back the frontiers on this most mundane of molecules. It embodies a set of policies aimed at pushing back the frontiers of poverty, while supporting growth and creating opportunities. This is extremely four-square stuff, even by the standards of an artist never renowned for pushing back the frontiers of avant-garde sonic exploration. Space telescopes and other space-based cosmological experiments are pushing back the frontiers of knowledge about the fundamental laws and history of the universe. Space exploration and exploitation is a major driving force in advancing the frontiers of knowledge. For years, astronomers have been slowly pushing back the frontiers of the observable universe - looking further and further away in terms of distance, and further and further back in time. NASA is constantly reaching to cross the frontiers of human knowledge and understanding. He noted the relevance of science and technology ‘to the struggle for development and pushing back the frontiers of poverty and underdevelopment’. Synonyms limit, end, edge, side, farthest point, boundary, border, boundary line, bound, bounding line, partition line, demarcation line, end point, cut-off point, termination Derivatives frontierless adjective Also discussed at length in the article is the frontierless character of the internet and its implications. Example sentencesExamples We need space exploration; without it, we heirs of Western civilization risk becoming a frontierless folk culture engaged in endless self-reflection. It was a place without any clear dimensions: a frontierless tract of land steeped in history. However, this collaboration occurs in a frontierless economy, thanks largely to modern Internet technology. On the other hand, the need to join with competent partners to face the present frontierless world requires a connection with those sharing the same fundamental interests. Origin Late Middle English: from Old French frontiere, based on Latin frons, front- 'front'. Definition of frontier in US English: frontier nounˌfrənˈtirˌfrənˈtɪr 1A line or border separating two countries. 边境，边界 Example sentencesExamples The man at the centre of the puzzle was born in Torquay in 1867 and first fell in love with South America when he helped the Bolivian government to survey its frontier with Brazil. From the village of Barqueiros about 70 km / 40 miles upstream from Oporto, the region fans out either side of the river stretching as far as the frontier with Spain. From Basle to Haguenau, the River Rhine acted as the frontier between Germany and France - and also as a very formidable defensive barrier. At the time the Russians said he had been shot by a border guard while crossing the frontier with Finland. He dreamed of being part of this growing nation, of helping expand its frontiers. Two border guards patrolling the nearby frontier with Georgia have also been reported missing since Friday night. The North Korean capital, Pyongyang, was captured a month later, and the UN forces advanced towards the frontier with China. Polish border police fighting smugglers of people, drugs, tobacco, nuclear material and weapons are employing American Indian trackers to guard the frontier with Ukraine. The high Andes peaks constitute its natural frontier with Bolivia and Argentina. This frontier with Belarus was now set to become the eastern frontier of Nato itself. Finally, in the spring of 1860 he sent the bulk of his army north to protect the frontier with the Papal States. Its function remains uncertain: it may have been conceived as a defensible barrier, or, more probably, as a well-defined frontier between two countries. Their reactors and weapons stockpiles are vulnerable, their frontiers are poorly controlled and key segments of their security services are often corrupt. Under his leadership in the 1840s, the Swazis expanded their territory to the Northwest and stabilized the southern frontier with the Zulus. The city is semicircled by the Sar Mountains and surmounted by an old Turkish fortress; the mountains are the frontier with Albania and Kosovo. The German concentration against France had left only one army to defend the eastern frontier. The frontier between India and Pakistan ran through the Sikh homeland of the Punjab. The waterway has its source in western Zambia, forming the frontier between Zimbabwe and Zambia and passing through central Mozambique before it empties into the Indian Ocean. In the main agreement, Germany recognized its frontier with France and Belgium as specified in the Treaty of Versailles, along with the demilitarized status of the Rhineland. Hundreds of thousands more are believed to be waiting on the Afghan side of the frontier with no shelter and little food. Synonyms border, boundary, partition, borderline, dividing line, bounding line, demarcation line 1.1 The extreme limit of settled land beyond which lies wilderness, especially referring to the western US before Pacific settlement. （靠近荒野的定居地的）边缘地带，边远地区，边疆（尤指美国人在太平洋沿岸定居之前的西部） his novel of the American frontier 他写的关于美国西部边疆开拓的小说。 Example sentencesExamples I give more credit to the nameless women who settled the frontier and thus earned the right to vote in western states. Until the 1890s, the black regiments served almost entirely at remote western frontier posts. We have always said that our story is like the story of the frontier towns and the hinterland outposts. The great slogan of the settlement of the western frontier during the middle parts of the 19th century was Get in, Get Rich, Get Out. Attempts by the British to restrict further expansion into the western frontier constituted one of the factors contributing to the Revolution. Settling the American frontier was a matter of private choice, as were decisions about moving on. Many times public houses were the first erected structures around which frontier towns grew. But perhaps it would be fairer to suggest that it was the frontier that failed the settlers. The frontier mentality and adversarial roles are being replaced with new models of sustainability. Tom Cruise and Nicole Kidman star as two hapless criminals who embark on a land rush on the western frontier. Differing colonial experiences and the settlement of the western frontier created strong and persistent regional political interests. The farther west the preachers and padres rode the less evidence they found of Christianity, not just in the rail towns but also in the frontier settlements a day's ride from the depots. The frontier mentality of moving on to fresh ground remains deeply embedded in the American psyche. Hard country tends to bring out a frontier mentality in its settlers, and there's not much evidence of concern for the environment in Arizona. For years, all was quiet as the Western frontier was slowly settled by a trickle of pioneers. Like many frontier outposts, Tombstone was a town divided. During this era of settlement of the prairie and western frontiers, a belief in the inevitability of white men's dominance of the landscape was prevalent. Americans saw little value in pushing this new frontier any further at the time. Now, the only Americana to die a more romantic cinematic death was the frontier in Westerns from the '70s. After the reductions following that war, the Army returned to its frontier outposts. 1.2 The extreme limit of understanding or achievement in a particular area. （某一学科）的知识（或成就）边缘，前沿，新领域 the success of science in extending the frontiers of knowledge 科学在开拓知识新领域方面所取得的成功。 Example sentencesExamples But a few intrepid researchers are still pushing back the frontiers on this most mundane of molecules. The upper part of Figure 8.1 shows the production possibility frontiers for the UK and USA. For years, astronomers have been slowly pushing back the frontiers of the observable universe - looking further and further away in terms of distance, and further and further back in time. The production possibility frontier has been all but shattered with innovation and continuous improvement. I'm interested in expanding the frontiers of real-world liberty, not spinning Utopias. This will change in the future as oceanic islands become more accessible and better known, but at present, for many Earth scientists, they remain at the frontiers of understanding. This is extremely four-square stuff, even by the standards of an artist never renowned for pushing back the frontiers of avant-garde sonic exploration. Science is hardly dead; as Laughlin says, the focus has merely shifted to different areas, pushing different frontiers with different tools in different quests. His research has begun to make progress in this area, expanding the frontier of visual neuroscience to the field of decision-making and cognitive neuroscience. Space exploration and exploitation is a major driving force in advancing the frontiers of knowledge. Those looking to push out the frontiers of our scientific understanding will be disappointed. It embodies a set of policies aimed at pushing back the frontiers of poverty, while supporting growth and creating opportunities. The banks have been pushing back the frontiers by launching ever more innovative and competitive loans. Space telescopes and other space-based cosmological experiments are pushing back the frontiers of knowledge about the fundamental laws and history of the universe. NASA is constantly reaching to cross the frontiers of human knowledge and understanding. He noted the relevance of science and technology ‘to the struggle for development and pushing back the frontiers of poverty and underdevelopment’. No, I just consider it pushing back the frontiers of Computing Science. The trick is to extend the frontiers of devolved responsibility, without falling over the edge into separatism. As a result they have pushed forward the frontiers of animal science and human medicine. We want to bring our students as quickly as possible to the frontier of current understanding. Synonyms limit, end, edge, side, farthest point, boundary, border, boundary line, bound, bounding line, partition line, demarcation line, end point, cut-off point, termination Origin Late Middle English: from Old French frontiere, based on Latin frons, front- ‘front’.
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