Definition of virtual in English:

virtual

adjective ˈvəːtjʊəlˈvəːtʃʊ(ə)lˈvərtʃ(u)əl

1Almost or nearly as described, but not completely or according to strict definition.
实际上的；实质上的，事实上的
the virtual absence of border controls
边境检控的实际缺失。
Example sentencesExamples
- This trend is quite worrisome because, in the virtual absence of private investment, public sector spending is expected to be a major source of stimulus to the economy.
- Newman understood church history as the recounting of all that is known about the progress of the kingdom of Christ on earth, a definition in virtual agreement with Schaff.
- Friday's phone conversation marked the first time she had contact with a Japanese Diet member since her release from nearly 20 months of virtual house arrest.
- We are only just in the process of developing laws that may protect our closest evolutionary relatives, the other hominids, from virtual extinction.
- Their findings offer scientists and herders a virtual history book describing how cattle, crucial to so many Africans, came to be so genetically diverse.
- The latest one-day action brought bus and underground services to a virtual halt in nearly 50 cities, with the exception of the capital Paris.
- With the virtual extinction of cod in the North Sea and serious problems with hake and haddock, the commission accepted that previous measures had failed.
- But they won't give the Red Sox the virtual certainty of a solid outing and a day of rest for the bullpen that Martinez does.
- Later Mrs Marsh ran a bed and breakfast business but that ended years ago and they were described by residents as virtual recluses.
- The first is the cost of research and the need for profits to justify such costs; the second is the absence from virtual markets of the purely profit-based phenomenon of arbitrage.
- The protests have been met with a virtual blackout by the media in Detroit, which has reacted generally with fear and confusion.
- But many of his views now seem to be echoed in Lord Ouseley's report, which described ‘a virtual apartheid’ in many of Bradford's secondary schools.
- One day the richest among us could turn nearly immortal, becoming virtual Gods to the rest of us.
- The aim for the US, says the head of US Customs, is to have a smarter border, a virtual border far afield from American shores.
- In some ways rather more disappointing was the virtual absence of alcohol from the tournament.
- Despite the virtual absence of pollutants and allergens there, fully one-third of the population of about 300 are asthma sufferers.
- Although he is a capable wicket-keeper and it enables the national side to play him as a virtual all rounder, his keeping has never quite reached the same high standard as his batting.
- For the past 24 hours coalition air and missile raids have come to a virtual standstill, according to a Kyodo News reporter in the capital.
- Eastern provinces near the Pakistan border have also become virtual no-go areas.
- The high plinth of the temple is a virtual tapestry of sculpture, with bands of dancing figures, animals, vegetation and other objects coming to life on its surface.
Synonyms
effective, in effect, near, near enough, essential, practical, for all practical purposes, to all intents and purposes, in all but name, indirect, implied, implicit, unacknowledged, tacit
2Computing
Not physically existing as such but made by software to appear to do so.
〔计算机〕虚拟的
virtual images
See also virtual reality
Example sentencesExamples
- It describes a virtual world that challenges how we perceive the real world.
- Mark described how a virtual tour is particularly beneficial for hotels, B&Bs and attraction centres.
- Meanwhile the virtualization engine maps the virtual devices to actual physical devices.
- You won't learn how to bake a cake or wallpaper the kitchen but you will have a thumping, pumping, roller-coaster ride through the virtual world of computer and video games.
- He explained that the software agents act as virtual astronomers, collecting, analysing and interpreting data continually.
- I've learned that I don't have the patience to minister to something that beeps every three minutes and those damn virtual pets are nearly impossible to kill.
- Since students only need the Internet to access the virtual computer lab, no physical presence on-campus is required.
- It is the closest to the Avatar or virtual agent that I described above that I have heard about.
- The Dutch town of Almere will host the world's first virtual city supercomputer or computer grid.
- If things go right and you decide to meet your virtual lover, here are some tips on how to maintain your safety when arranging face-to-face meetings.
- This paper explores the potential for developing virtual dissection software for physical collaboration.
- Once they figured out how to get Trojans onto computer, creating their own virtual spamming super computer, spammers have adopted this method for most of the spam they send out.
- The software that drives the virtual tape engine emulates tape devices on disk and manages the movement of data from cache to tape and back.
- The result is that the markets of these games have spilled out of their virtual borders and into the real world.
- It is worth recognising that, until recently, usage of such virtual workstation software has usually been limited to those with relatively well-developed IT skills.
- First, the judge ruled that a player has a claim of ownership to virtual property in computer game.
- The software offers a virtual disk assignment that replaced more complex hardware-intensive reconfigurations.
- Eliminate any software that creates virtual disk volumes.
- The software also supports multiple virtual desktops.
- A virtual break-in is nearly impossible in theory, but it is never wise to count out that one clever hacker.
1. 2.1 Carried out, accessed, or stored by means of a computer, especially over a network.
  虚拟的
  a virtual library
  虚拟图书馆。
  virtual learning
  虚拟学习。
  Example sentencesExamples
  There is a major need for expert mediated virtual libraries (VLs) of well-selected and described links to scholarly and educational resources.
  The technology of virtual education can revise or remake the limits, which are given us by our histories and by nature.
  Yet it is the teachers who must make the virtual classroom - with all its practicalities - actually function.
  Facebook will hold virtual townhall meetings and will collect comments on the documents until March 29.
  One museum Web site featured a virtual tour of the museum's physical galleries.
3Optics
Relating to the points at which rays would meet if produced backwards.
〔光学〕虚的，虚拟的
4Mechanics
Relating to or denoting infinitesimal displacements of a point in a system.
〔机械学〕虚的
Example sentencesExamples
- The frames feature a unique Four-Bar linkage to create a stationary virtual pivot point on the pedal axle of the bike.
5Physics
Denoting particles or interactions with extremely short lifetimes and (owing to the uncertainty principle) indefinitely great energies, postulated as intermediates in some processes.
〔物理〕虚的
Example sentencesExamples
- But the gluons are unlike the carrier particles of the electromagnetic force which appeared along with the virtual electrons and positrons.
- The only thing that prevents these virtual particles from coming into permanent existence is a lack of energy.
- We look for virtual photons, those never-seen particles of force and energy, for an explanation.
- The resulting electric field would create a plasma of electrons and positrons from among the virtual particles surrounding the star.
- An electron blasts a proton and neutron into myriad virtual particles, which then reconfigure themselves into two double-quark particles.

Derivatives

virtuality

noun vəːtjʊˈalɪtivəːtʃʊˈalɪtiˌvərtʃuˈælədi

Letting go is an interesting gesture, because in fact it's almost like invoking the virtuality of the self, just putting it spontaneously on the table.
Example sentencesExamples
- What's important here is that this virtuality had actual consequences: it erased particular histories and experiences.
- The issue doesn't strike me as being one of virtuality versus materiality.
- So should we expect reality and virtuality to diverge?
- Instead, we believe that actions can begin, unfold and conclude entirely online, and that virtuality has its own set of ethics and value systems that do not correspond to the rest of reality.

Origin

Late Middle English (also in the sense 'possessing certain virtues'): from medieval Latin virtualis, from Latin virtus 'virtue', suggested by late Latin virtuosus.

Definition of virtual in US English:

virtual

adjectiveˈvərtʃ(u)əlˈvərCH(o͞o)əl

1Almost or nearly as described, but not completely or according to strict definition.
实际上的；实质上的，事实上的
the virtual absence of border controls
边境检控的实际缺失。
Example sentencesExamples
- Despite the virtual absence of pollutants and allergens there, fully one-third of the population of about 300 are asthma sufferers.
- The latest one-day action brought bus and underground services to a virtual halt in nearly 50 cities, with the exception of the capital Paris.
- This trend is quite worrisome because, in the virtual absence of private investment, public sector spending is expected to be a major source of stimulus to the economy.
- The high plinth of the temple is a virtual tapestry of sculpture, with bands of dancing figures, animals, vegetation and other objects coming to life on its surface.
- The first is the cost of research and the need for profits to justify such costs; the second is the absence from virtual markets of the purely profit-based phenomenon of arbitrage.
- We are only just in the process of developing laws that may protect our closest evolutionary relatives, the other hominids, from virtual extinction.
- Friday's phone conversation marked the first time she had contact with a Japanese Diet member since her release from nearly 20 months of virtual house arrest.
- For the past 24 hours coalition air and missile raids have come to a virtual standstill, according to a Kyodo News reporter in the capital.
- Eastern provinces near the Pakistan border have also become virtual no-go areas.
- Their findings offer scientists and herders a virtual history book describing how cattle, crucial to so many Africans, came to be so genetically diverse.
- Newman understood church history as the recounting of all that is known about the progress of the kingdom of Christ on earth, a definition in virtual agreement with Schaff.
- The protests have been met with a virtual blackout by the media in Detroit, which has reacted generally with fear and confusion.
- The aim for the US, says the head of US Customs, is to have a smarter border, a virtual border far afield from American shores.
- Later Mrs Marsh ran a bed and breakfast business but that ended years ago and they were described by residents as virtual recluses.
- Although he is a capable wicket-keeper and it enables the national side to play him as a virtual all rounder, his keeping has never quite reached the same high standard as his batting.
- But many of his views now seem to be echoed in Lord Ouseley's report, which described ‘a virtual apartheid’ in many of Bradford's secondary schools.
- One day the richest among us could turn nearly immortal, becoming virtual Gods to the rest of us.
- But they won't give the Red Sox the virtual certainty of a solid outing and a day of rest for the bullpen that Martinez does.
- With the virtual extinction of cod in the North Sea and serious problems with hake and haddock, the commission accepted that previous measures had failed.
- In some ways rather more disappointing was the virtual absence of alcohol from the tournament.
Synonyms
effective, in effect, near, near enough, essential, practical, for all practical purposes, to all intents and purposes, in all but name, indirect, implied, implicit, unacknowledged, tacit
1. 1.1Computing Not physically existing as such but made by software to appear to do so.
  〔计算机〕虚拟的
  a virtual computer
  虚拟计算机。参见VIRTUAL REALITY。
  See also virtual reality
  Example sentencesExamples
  The result is that the markets of these games have spilled out of their virtual borders and into the real world.
  It describes a virtual world that challenges how we perceive the real world.
  If things go right and you decide to meet your virtual lover, here are some tips on how to maintain your safety when arranging face-to-face meetings.
  The Dutch town of Almere will host the world's first virtual city supercomputer or computer grid.
  First, the judge ruled that a player has a claim of ownership to virtual property in computer game.
  The software offers a virtual disk assignment that replaced more complex hardware-intensive reconfigurations.
  It is worth recognising that, until recently, usage of such virtual workstation software has usually been limited to those with relatively well-developed IT skills.
  Mark described how a virtual tour is particularly beneficial for hotels, B&Bs and attraction centres.
  You won't learn how to bake a cake or wallpaper the kitchen but you will have a thumping, pumping, roller-coaster ride through the virtual world of computer and video games.
  This paper explores the potential for developing virtual dissection software for physical collaboration.
  The software that drives the virtual tape engine emulates tape devices on disk and manages the movement of data from cache to tape and back.
  Once they figured out how to get Trojans onto computer, creating their own virtual spamming super computer, spammers have adopted this method for most of the spam they send out.
  A virtual break-in is nearly impossible in theory, but it is never wise to count out that one clever hacker.
  I've learned that I don't have the patience to minister to something that beeps every three minutes and those damn virtual pets are nearly impossible to kill.
  Eliminate any software that creates virtual disk volumes.
  The software also supports multiple virtual desktops.
  Meanwhile the virtualization engine maps the virtual devices to actual physical devices.
  He explained that the software agents act as virtual astronomers, collecting, analysing and interpreting data continually.
  Since students only need the Internet to access the virtual computer lab, no physical presence on-campus is required.
  It is the closest to the Avatar or virtual agent that I described above that I have heard about.
2. 1.2 Carried out, accessed, or stored by means of a computer, especially over a network.
  虚拟的
  a virtual library
  虚拟图书馆。
  virtual learning
  虚拟学习。
  Example sentencesExamples
  The technology of virtual education can revise or remake the limits, which are given us by our histories and by nature.
  Yet it is the teachers who must make the virtual classroom - with all its practicalities - actually function.
  Facebook will hold virtual townhall meetings and will collect comments on the documents until March 29.
  There is a major need for expert mediated virtual libraries (VLs) of well-selected and described links to scholarly and educational resources.
  One museum Web site featured a virtual tour of the museum's physical galleries.
3. 1.3Optics Relating to the points at which rays would meet if produced backward.
  〔光学〕虚的，虚拟的
4. 1.4Physics Denoting particles or interactions with extremely short lifetimes and (owing to the uncertainty principle) indefinitely great energies, postulated as intermediates in some processes.
  〔物理〕虚的
  Example sentencesExamples
  We look for virtual photons, those never-seen particles of force and energy, for an explanation.
  An electron blasts a proton and neutron into myriad virtual particles, which then reconfigure themselves into two double-quark particles.
  But the gluons are unlike the carrier particles of the electromagnetic force which appeared along with the virtual electrons and positrons.
  The only thing that prevents these virtual particles from coming into permanent existence is a lack of energy.
  The resulting electric field would create a plasma of electrons and positrons from among the virtual particles surrounding the star.

Origin

Late Middle English (also in the sense ‘possessing certain virtues’): from medieval Latin virtualis, from Latin virtus ‘virtue’, suggested by late Latin virtuosus.

词汇	virtual
释义	Definition of virtual in English: virtual adjective ˈvəːtjʊəlˈvəːtʃʊ(ə)lˈvərtʃ(u)əl 1Almost or nearly as described, but not completely or according to strict definition. 实际上的；实质上的，事实上的 the virtual absence of border controls 边境检控的实际缺失。 Example sentencesExamples This trend is quite worrisome because, in the virtual absence of private investment, public sector spending is expected to be a major source of stimulus to the economy. Newman understood church history as the recounting of all that is known about the progress of the kingdom of Christ on earth, a definition in virtual agreement with Schaff. Friday's phone conversation marked the first time she had contact with a Japanese Diet member since her release from nearly 20 months of virtual house arrest. We are only just in the process of developing laws that may protect our closest evolutionary relatives, the other hominids, from virtual extinction. Their findings offer scientists and herders a virtual history book describing how cattle, crucial to so many Africans, came to be so genetically diverse. The latest one-day action brought bus and underground services to a virtual halt in nearly 50 cities, with the exception of the capital Paris. With the virtual extinction of cod in the North Sea and serious problems with hake and haddock, the commission accepted that previous measures had failed. But they won't give the Red Sox the virtual certainty of a solid outing and a day of rest for the bullpen that Martinez does. Later Mrs Marsh ran a bed and breakfast business but that ended years ago and they were described by residents as virtual recluses. The first is the cost of research and the need for profits to justify such costs; the second is the absence from virtual markets of the purely profit-based phenomenon of arbitrage. The protests have been met with a virtual blackout by the media in Detroit, which has reacted generally with fear and confusion. But many of his views now seem to be echoed in Lord Ouseley's report, which described ‘a virtual apartheid’ in many of Bradford's secondary schools. One day the richest among us could turn nearly immortal, becoming virtual Gods to the rest of us. The aim for the US, says the head of US Customs, is to have a smarter border, a virtual border far afield from American shores. In some ways rather more disappointing was the virtual absence of alcohol from the tournament. Despite the virtual absence of pollutants and allergens there, fully one-third of the population of about 300 are asthma sufferers. Although he is a capable wicket-keeper and it enables the national side to play him as a virtual all rounder, his keeping has never quite reached the same high standard as his batting. For the past 24 hours coalition air and missile raids have come to a virtual standstill, according to a Kyodo News reporter in the capital. Eastern provinces near the Pakistan border have also become virtual no-go areas. The high plinth of the temple is a virtual tapestry of sculpture, with bands of dancing figures, animals, vegetation and other objects coming to life on its surface. Synonyms effective, in effect, near, near enough, essential, practical, for all practical purposes, to all intents and purposes, in all but name, indirect, implied, implicit, unacknowledged, tacit 2Computing Not physically existing as such but made by software to appear to do so. 〔计算机〕虚拟的 virtual images See also virtual reality Example sentencesExamples It describes a virtual world that challenges how we perceive the real world. Mark described how a virtual tour is particularly beneficial for hotels, B&Bs and attraction centres. Meanwhile the virtualization engine maps the virtual devices to actual physical devices. You won't learn how to bake a cake or wallpaper the kitchen but you will have a thumping, pumping, roller-coaster ride through the virtual world of computer and video games. He explained that the software agents act as virtual astronomers, collecting, analysing and interpreting data continually. I've learned that I don't have the patience to minister to something that beeps every three minutes and those damn virtual pets are nearly impossible to kill. Since students only need the Internet to access the virtual computer lab, no physical presence on-campus is required. It is the closest to the Avatar or virtual agent that I described above that I have heard about. The Dutch town of Almere will host the world's first virtual city supercomputer or computer grid. If things go right and you decide to meet your virtual lover, here are some tips on how to maintain your safety when arranging face-to-face meetings. This paper explores the potential for developing virtual dissection software for physical collaboration. Once they figured out how to get Trojans onto computer, creating their own virtual spamming super computer, spammers have adopted this method for most of the spam they send out. The software that drives the virtual tape engine emulates tape devices on disk and manages the movement of data from cache to tape and back. The result is that the markets of these games have spilled out of their virtual borders and into the real world. It is worth recognising that, until recently, usage of such virtual workstation software has usually been limited to those with relatively well-developed IT skills. First, the judge ruled that a player has a claim of ownership to virtual property in computer game. The software offers a virtual disk assignment that replaced more complex hardware-intensive reconfigurations. Eliminate any software that creates virtual disk volumes. The software also supports multiple virtual desktops. A virtual break-in is nearly impossible in theory, but it is never wise to count out that one clever hacker. 2.1 Carried out, accessed, or stored by means of a computer, especially over a network. 虚拟的 a virtual library 虚拟图书馆。 virtual learning 虚拟学习。 Example sentencesExamples There is a major need for expert mediated virtual libraries (VLs) of well-selected and described links to scholarly and educational resources. The technology of virtual education can revise or remake the limits, which are given us by our histories and by nature. Yet it is the teachers who must make the virtual classroom - with all its practicalities - actually function. Facebook will hold virtual townhall meetings and will collect comments on the documents until March 29. One museum Web site featured a virtual tour of the museum's physical galleries. 3Optics Relating to the points at which rays would meet if produced backwards. 〔光学〕虚的，虚拟的 4Mechanics Relating to or denoting infinitesimal displacements of a point in a system. 〔机械学〕虚的 Example sentencesExamples The frames feature a unique Four-Bar linkage to create a stationary virtual pivot point on the pedal axle of the bike. 5Physics Denoting particles or interactions with extremely short lifetimes and (owing to the uncertainty principle) indefinitely great energies, postulated as intermediates in some processes. 〔物理〕虚的 Example sentencesExamples But the gluons are unlike the carrier particles of the electromagnetic force which appeared along with the virtual electrons and positrons. The only thing that prevents these virtual particles from coming into permanent existence is a lack of energy. We look for virtual photons, those never-seen particles of force and energy, for an explanation. The resulting electric field would create a plasma of electrons and positrons from among the virtual particles surrounding the star. An electron blasts a proton and neutron into myriad virtual particles, which then reconfigure themselves into two double-quark particles. Derivatives virtuality noun vəːtjʊˈalɪtivəːtʃʊˈalɪtiˌvərtʃuˈælədi Letting go is an interesting gesture, because in fact it's almost like invoking the virtuality of the self, just putting it spontaneously on the table. Example sentencesExamples What's important here is that this virtuality had actual consequences: it erased particular histories and experiences. The issue doesn't strike me as being one of virtuality versus materiality. So should we expect reality and virtuality to diverge? Instead, we believe that actions can begin, unfold and conclude entirely online, and that virtuality has its own set of ethics and value systems that do not correspond to the rest of reality. Origin Late Middle English (also in the sense 'possessing certain virtues'): from medieval Latin virtualis, from Latin virtus 'virtue', suggested by late Latin virtuosus. Definition of virtual in US English: virtual adjectiveˈvərtʃ(u)əlˈvərCH(o͞o)əl 1Almost or nearly as described, but not completely or according to strict definition. 实际上的；实质上的，事实上的 the virtual absence of border controls 边境检控的实际缺失。 Example sentencesExamples Despite the virtual absence of pollutants and allergens there, fully one-third of the population of about 300 are asthma sufferers. The latest one-day action brought bus and underground services to a virtual halt in nearly 50 cities, with the exception of the capital Paris. This trend is quite worrisome because, in the virtual absence of private investment, public sector spending is expected to be a major source of stimulus to the economy. The high plinth of the temple is a virtual tapestry of sculpture, with bands of dancing figures, animals, vegetation and other objects coming to life on its surface. The first is the cost of research and the need for profits to justify such costs; the second is the absence from virtual markets of the purely profit-based phenomenon of arbitrage. We are only just in the process of developing laws that may protect our closest evolutionary relatives, the other hominids, from virtual extinction. Friday's phone conversation marked the first time she had contact with a Japanese Diet member since her release from nearly 20 months of virtual house arrest. For the past 24 hours coalition air and missile raids have come to a virtual standstill, according to a Kyodo News reporter in the capital. Eastern provinces near the Pakistan border have also become virtual no-go areas. Their findings offer scientists and herders a virtual history book describing how cattle, crucial to so many Africans, came to be so genetically diverse. Newman understood church history as the recounting of all that is known about the progress of the kingdom of Christ on earth, a definition in virtual agreement with Schaff. The protests have been met with a virtual blackout by the media in Detroit, which has reacted generally with fear and confusion. The aim for the US, says the head of US Customs, is to have a smarter border, a virtual border far afield from American shores. Later Mrs Marsh ran a bed and breakfast business but that ended years ago and they were described by residents as virtual recluses. Although he is a capable wicket-keeper and it enables the national side to play him as a virtual all rounder, his keeping has never quite reached the same high standard as his batting. But many of his views now seem to be echoed in Lord Ouseley's report, which described ‘a virtual apartheid’ in many of Bradford's secondary schools. One day the richest among us could turn nearly immortal, becoming virtual Gods to the rest of us. But they won't give the Red Sox the virtual certainty of a solid outing and a day of rest for the bullpen that Martinez does. With the virtual extinction of cod in the North Sea and serious problems with hake and haddock, the commission accepted that previous measures had failed. In some ways rather more disappointing was the virtual absence of alcohol from the tournament. Synonyms effective, in effect, near, near enough, essential, practical, for all practical purposes, to all intents and purposes, in all but name, indirect, implied, implicit, unacknowledged, tacit 1.1Computing Not physically existing as such but made by software to appear to do so. 〔计算机〕虚拟的 a virtual computer 虚拟计算机。参见VIRTUAL REALITY。 See also virtual reality Example sentencesExamples The result is that the markets of these games have spilled out of their virtual borders and into the real world. It describes a virtual world that challenges how we perceive the real world. If things go right and you decide to meet your virtual lover, here are some tips on how to maintain your safety when arranging face-to-face meetings. The Dutch town of Almere will host the world's first virtual city supercomputer or computer grid. First, the judge ruled that a player has a claim of ownership to virtual property in computer game. The software offers a virtual disk assignment that replaced more complex hardware-intensive reconfigurations. It is worth recognising that, until recently, usage of such virtual workstation software has usually been limited to those with relatively well-developed IT skills. Mark described how a virtual tour is particularly beneficial for hotels, B&Bs and attraction centres. You won't learn how to bake a cake or wallpaper the kitchen but you will have a thumping, pumping, roller-coaster ride through the virtual world of computer and video games. This paper explores the potential for developing virtual dissection software for physical collaboration. The software that drives the virtual tape engine emulates tape devices on disk and manages the movement of data from cache to tape and back. Once they figured out how to get Trojans onto computer, creating their own virtual spamming super computer, spammers have adopted this method for most of the spam they send out. A virtual break-in is nearly impossible in theory, but it is never wise to count out that one clever hacker. I've learned that I don't have the patience to minister to something that beeps every three minutes and those damn virtual pets are nearly impossible to kill. Eliminate any software that creates virtual disk volumes. The software also supports multiple virtual desktops. Meanwhile the virtualization engine maps the virtual devices to actual physical devices. He explained that the software agents act as virtual astronomers, collecting, analysing and interpreting data continually. Since students only need the Internet to access the virtual computer lab, no physical presence on-campus is required. It is the closest to the Avatar or virtual agent that I described above that I have heard about. 1.2 Carried out, accessed, or stored by means of a computer, especially over a network. 虚拟的 a virtual library 虚拟图书馆。 virtual learning 虚拟学习。 Example sentencesExamples The technology of virtual education can revise or remake the limits, which are given us by our histories and by nature. Yet it is the teachers who must make the virtual classroom - with all its practicalities - actually function. Facebook will hold virtual townhall meetings and will collect comments on the documents until March 29. There is a major need for expert mediated virtual libraries (VLs) of well-selected and described links to scholarly and educational resources. One museum Web site featured a virtual tour of the museum's physical galleries. 1.3Optics Relating to the points at which rays would meet if produced backward. 〔光学〕虚的，虚拟的 1.4Physics Denoting particles or interactions with extremely short lifetimes and (owing to the uncertainty principle) indefinitely great energies, postulated as intermediates in some processes. 〔物理〕虚的 Example sentencesExamples We look for virtual photons, those never-seen particles of force and energy, for an explanation. An electron blasts a proton and neutron into myriad virtual particles, which then reconfigure themselves into two double-quark particles. But the gluons are unlike the carrier particles of the electromagnetic force which appeared along with the virtual electrons and positrons. The only thing that prevents these virtual particles from coming into permanent existence is a lack of energy. The resulting electric field would create a plasma of electrons and positrons from among the virtual particles surrounding the star. Origin Late Middle English (also in the sense ‘possessing certain virtues’): from medieval Latin virtualis, from Latin virtus ‘virtue’, suggested by late Latin virtuosus.
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