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词汇 a
释义

a1

(also an)
determiner ə
  • 1Used when mentioning someone or something for the first time in a text or conversation.

    用于第一次提及某人或某事物有个,某个,一个

    a man came out of the room

    一个男人走出了房间。

    Compare with the
    it has been an honour to meet you

    你能来真是荣幸。

    Example sentencesExamples
    • He has also written an opera and translated Dante's Inferno in order to produce an illustrated book of it.
    • My wife got me an unexpected Christmas gift this year.
    • Jack crouched down and hid behind a tree trunk.
    • I received an email from Jo today.
    • Bob's conducting a three-year internet romance with a girl he's never met.
    • An internal report written by a manager at the nuclear waste reprocessing plant was leaked this week.
    • We had to write a story about a natural disaster for creative writing.
    • Before making a decision, do an assessment of how you want to use your phone.
    • Children need a place for their computer equipment, and parents need closet space for their clothing.
    • "That campaign definitely had an effect," she says.
    1. 1.1 Used with units of measurement to mean one such unit.
      与度量单位连用,表示一个单位
      a hundred

      一百。

      a quarter of an hour

      一刻钟。

      Example sentencesExamples
      • I stopped to pick up a gallon of milk on my way home from work.
      • I look at these miserable people, and wouldn't trade my life with theirs for a million dollars.
      • There is barely an ounce of fat on his body, and he continues to make his team-mates look chubby.
      • About a mile further down the road, another dog ran out in front of the taxi.
      • I sent off an e-mail, just an hour ago, and he's already got me back online.
      • The attack came amid a major upsurge in violence across the country that has left a thousand dead.
    2. 1.2with negative One single; any.
      一个;任何一个
      I simply haven't a thing to wear

      我简直没有衣服可穿。

      Example sentencesExamples
      • I think there's not a person born that doesn't have a gift to offer in some way.
      • Incensed at the fiasco, I went back to the website to try and find a telephone number to call - not a thing!
      • I had to own up to the fact that I'd never read a word by Crofts.
      • The film looks fantastic: there is not a spot, or a scratch, or a visual defect to be seen.
      • Most refugees say they never saw a drop of food aid - despite almost one million tonnes flooding into the country every year.
    3. 1.3 Used when mentioning the name of someone not known to the speaker.
      用于提及说话者不认识的人某一个
      a Mr Smith telephoned

      有个史密斯先生打电话来过。

      Example sentencesExamples
      • He was sent two poems from a Miss Ethel Malley, who wrote saying they were found among her brother's possessions after his death.
      • Does anyone know a Mr Daeller?
      • She was born in about 1670, the daughter of a Mr Freeman of Holbeach in Lincolnshire.
      • On September 29 a letter arrived at our address for a Ms L Doherty.
      • The latest letter was from a Mrs Singh, who complained about two radio stations.
    4. 1.4 Someone like (the name specified)
      与具体人名连用像…的人
      you're no better than a Hitler

      你就像个希特勒。

      Example sentencesExamples
      • You need the methods of a Roosevelt.
      • Moore says that the organization has passed its Chamberlain period, and is now in need of a Churchill.
      • Regarding academic medicine, it has become increasingly difficult for a Freud or a Mendel to gain recognition without university affiliation or corporate sponsorship.
      • Called a Judas by his countrymen, he received an elbow from another player, and left the pitch injured.
      • What he lacks is the charisma of an Olivier, whose epochal Coriolanus is dazzlingly evoked in two pages of Kenneth Tynan's Curtains.
  • 2Used to indicate membership of a class of people or things.

    用于表示某一类人或事物一个,一

    he is a lawyer

    他是律师。

    this car is a BMW

    这是辆宝马车。

    Example sentencesExamples
    • Notice that every car seen in the show is a Chevrolet, out of consideration for their sponsor.
    • Lilly is a Siamese cat who survived a two-week cross-country move while stuck in a drawer.
    • In 1984 he was granted his fervent wish to acquire a Picasso.
    • She's a banker, married to a stockbroker, and they have a daughter about the same age as Amy.
    • My mom's a pharmacist and my dad's a realtor.
  • 3In, to, or for each; per (used when expressing rates or ratios)

    用于表示速度或比率

    typing 60 words a minute

    每分钟打60个词。

    a move to raise petrol prices by 3p a litre

    将汽油价格每升提高三便士的动议。

    Example sentencesExamples
    • You can't drive over five miles an hour down any street in New York.
    • The price of gold rose last week to $309 an ounce - and at one point was $312, its highest for two years.
    • I type 15 words a minute with a lot of mistakes.
    • The site takes in 2,000 tons of trash on a typical day, charging an average $30 a ton.
    • The truckers are angry at the rise in diesel prices, which currently average 81.3p a litre.

Usage

On the question of using a or an before words beginning with h, see an

Origin

Middle English: weak form of Old English ān 'one'.

a2

abbreviation
  • 1(in travel timetables) arrives.

    用于旅行时刻表同arrives

    Penzance a 0915

    9点15分到达彭赞斯。

  • 2in combination (in units of measurement) atto- (10⁻¹⁸).

    (度量单位)同 ATTO-

  • 3British (with reference to sporting fixtures) away.

    〈英〉(比赛的安排)同 AWAY

    March 15 Sheffield United (a)

    谢菲尔德联队将于3月15日在客场举行比赛。

  • 4(used before a date) before.

    在…之前(用于日期之前)

    a1200

    1200年前。

"a"Physics
  • Acceleration.

    〔物理〕加速度

A3

(also a)
nounPlural A's, Plural As, Plural as
  • 1The first letter of the alphabet.

    1. 1.1 Denoting the first in a set of items, categories, sizes, etc.
    2. 1.2 Denoting the first of two or more hypothetical people or things.
      suppose A had killed B
    3. 1.3 The highest class of academic mark.
      a dazzling array of straight A's
    4. 1.4 (in the UK) denoting the most important category of road, other than a motorway.
      the A34
      busy A-roads
    5. 1.5 Denoting the highest-earning socio-economic category for marketing purposes, including top management and senior professional personnel.
    6. 1.6Chess Denoting the first file from the left, as viewed from White's side of the board.
    7. 1.7 The first constant to appear in an algebraic expression.
    8. 1.8Geology Denoting the uppermost soil horizon, especially the topsoil.
    9. 1.9 The human blood type (in the ABO system) containing the A antigen and lacking the B.
    10. 1.10 (with numeral) denoting a series of international standard paper sizes each twice the area of the next, as A0, A1, A2, A3, A4, etc., A4 being 210 × 297 mm.
  • 2A shape like that of a capital A.

    in combination an A-shape
  • 3Music
    The sixth note of the diatonic scale of C major. The A above middle C is usually used as the basis for tuning and in modern music has a standard frequency of 440 Hz.

    1. 3.1 A key based on a scale with A as its keynote.

Phrases

  • from A to B

    • From one's starting point to one's destination.

      most road atlases will get you from A to B
      Example sentencesExamples
      • It must also be rather boring and predictable sailing directly and single-mindedly from A to B to C.
      • How else would you get someone from A to B unless you've used an airplane?
      • As well as finding you the best way from A to B, the operators can also provide an emergency and breakdown service.
      • Ask the ‘British Bobby’ for the nearest toilet or how to get from A to B, it is all part of his job.
      • We need to put all the other things to one side and get from A to B safely at the appropriate speed.
      • I wanted to show people how to get from A to B in your life.
      • People who need to travel from A to B will take an alternative route.
      • You could go from A to B directly, walking fast, neglecting the scenery, or instead you could choose to take your time.
      • She said: ‘People will still be able to get from A to B - it may just take them that bit longer.’
      • The drivers are not concentrating and just going from A to B to distribute the goods.
  • from A to Z

    • Over the entire range; completely.

      make sure you understand the subject from A to Z
      Example sentencesExamples
      • If everything is explained to us, from A to Z, then even an idiot can grasp it.
      • If you complete all the steps from A to Z, the mission is a success.
      • They could argue about who was smarter, who the teachers liked best, anything from A to Z they could argue about.
      • The process moves from A to Z without cutting corners.
      • They moved in with a heavy barrage of speculation from A to Z.
      • Going through your list of accounts from A to Z won't really work.
      • Most of my work has been in the comedy genre, so it's a dream role to get a chance to play a character that has a trajectory from A to Z.
      • Instead, the opposition wants an independent committee to oversee the election from A to Z.
      • It wouldn't be something I'd have to take from A to Z, point-by-point, and argue and describe.
      • The person has to fit from A to Z or else they're just not wanted.
  • plan A

    • One's original plan or strategy.

      plan A having gone horribly wrong, Ferguson used the interval to change his formation
      Compare with plan B
      Example sentencesExamples
      • Plan A is actually just to turn up on the day and make it up.
      • This is plan A; this is what I plan to do.
      • If their coaches are talking differently October 1, you'll know Plan A didn't quite work.
      • Plan A, business as usual, is no longer a viable option.
      • I think the only reason you're back now is because Plan A disintegrated and I'm your contingency.
      • That's plan A, but I've a number of other plans.
      • Plan A had been for me to travel with Connie on the train, but there were no seats available.
      • You either continue with plan A, or you look at alternatives.
      • We can't even resort to Plan B these days because we haven't got a Plan A!
      • We had Plan A and Plan B and Plan C.
      • I don't know what plan A was, but it evidently failed.
      • You've got to still have a Plan B if Plan A doesn't work.
      • However, since football is now a 16-man game, he can bring on talented substitutes if plan A is not working.
      • We had a review in the first week of the work to see if plan A was still the best way forward.
      • Have a plan B in case plan A fails.
      • Business as usual - Plan A - is clearly not working.
      • Fortunately, I have appealing contingency plans, but still first I'll apply myself to plan A with all my strength.
      • Why not just carry on with Plan A as if nothing has happened?
      • Plan A, to propose on Detonator, backfired when she saw the ride on the website and refused to go on it.
abbreviation
  • 1(in card games) ace.

    you cash ♥AK
  • 2Against (heading the column in a table of sports results which shows the goals or points scored against each club).

  • 3informal A level.

  • 4Ampere(s).

  • 5Ångstrom(s).

  • 6Attack (in designations of US aircraft types)

    an A-10
  • 7Answer.

    Q: What is a hung parliament? A: One in which no single party has an overall majority
  • 8(in names of sports clubs) Athletic.

    Dunfermline A
  • 9Austria (international vehicle registration).

a1

(also an)
determiner
  • 1Used when referring to someone or something for the first time in a text or conversation.

    用于第一次提及某人或某事物有个,某个,一个

    a man came out of the room

    一个男人走出了房间。

    Compare with the
    it has been an honor to have you

    你能来真是荣幸。

    we need people with a knowledge of languages

    我们需要有语言知识的人。比较 THE

    Example sentencesExamples
    • My wife got me an unexpected Christmas gift this year.
    • Before making a decision, do an assessment of how you want to use your phone.
    • Bob's conducting a three-year internet romance with a girl he's never met.
    • An internal report written by a manager at the nuclear waste reprocessing plant was leaked this week.
    • "That campaign definitely had an effect," she says.
    • We had to write a story about a natural disaster for creative writing.
    • I received an email from Jo today.
    • Children need a place for their computer equipment, and parents need closet space for their clothing.
    • He has also written an opera and translated Dante's Inferno in order to produce an illustrated book of it.
    • Jack crouched down and hid behind a tree trunk.
    1. 1.1 Used with units of measurement to mean one such unit.
      与度量单位连用,表示一个单位
      a hundred

      一百。

      a quarter of an hour

      一刻钟。

      Example sentencesExamples
      • There is barely an ounce of fat on his body, and he continues to make his team-mates look chubby.
      • I stopped to pick up a gallon of milk on my way home from work.
      • I look at these miserable people, and wouldn't trade my life with theirs for a million dollars.
      • I sent off an e-mail, just an hour ago, and he's already got me back online.
      • The attack came amid a major upsurge in violence across the country that has left a thousand dead.
      • About a mile further down the road, another dog ran out in front of the taxi.
    2. 1.2with negative One single; any.
      一个;任何一个
      I simply haven't a thing to wear

      我简直没有衣服可穿。

      Example sentencesExamples
      • Most refugees say they never saw a drop of food aid - despite almost one million tonnes flooding into the country every year.
      • I think there's not a person born that doesn't have a gift to offer in some way.
      • The film looks fantastic: there is not a spot, or a scratch, or a visual defect to be seen.
      • Incensed at the fiasco, I went back to the website to try and find a telephone number to call - not a thing!
      • I had to own up to the fact that I'd never read a word by Crofts.
    3. 1.3 Used when mentioning the name of someone not known to the speaker.
      用于提及说话者不认识的人某一个
      a Mr. Smith telephoned

      有个史密斯先生打电话来过。

      Example sentencesExamples
      • The latest letter was from a Mrs Singh, who complained about two radio stations.
      • She was born in about 1670, the daughter of a Mr Freeman of Holbeach in Lincolnshire.
      • He was sent two poems from a Miss Ethel Malley, who wrote saying they were found among her brother's possessions after his death.
      • Does anyone know a Mr Daeller?
      • On September 29 a letter arrived at our address for a Ms L Doherty.
    4. 1.4 Someone like (the name specified)
      与具体人名连用像…的人
      you're no better than a Hitler

      你就像个希特勒。

      Example sentencesExamples
      • You need the methods of a Roosevelt.
      • Regarding academic medicine, it has become increasingly difficult for a Freud or a Mendel to gain recognition without university affiliation or corporate sponsorship.
      • What he lacks is the charisma of an Olivier, whose epochal Coriolanus is dazzlingly evoked in two pages of Kenneth Tynan's Curtains.
      • Called a Judas by his countrymen, he received an elbow from another player, and left the pitch injured.
      • Moore says that the organization has passed its Chamberlain period, and is now in need of a Churchill.
  • 2Used to indicate membership of a class of people or things.

    用于表示某一类人或事物一个,一

    he is a lawyer

    他是律师。

    this car is a BMW

    这是辆宝马车。

    Example sentencesExamples
    • Lilly is a Siamese cat who survived a two-week cross-country move while stuck in a drawer.
    • My mom's a pharmacist and my dad's a realtor.
    • She's a banker, married to a stockbroker, and they have a daughter about the same age as Amy.
    • In 1984 he was granted his fervent wish to acquire a Picasso.
    • Notice that every car seen in the show is a Chevrolet, out of consideration for their sponsor.
  • 3Used when expressing rates or ratios; in, to, or for each; per.

    typing 60 words a minute

    每分钟打60个词。

    cost as much as eight dollars a dozen
    Example sentencesExamples
    • The truckers are angry at the rise in diesel prices, which currently average 81.3p a litre.
    • I type 15 words a minute with a lot of mistakes.
    • The price of gold rose last week to $309 an ounce - and at one point was $312, its highest for two years.
    • You can't drive over five miles an hour down any street in New York.
    • The site takes in 2,000 tons of trash on a typical day, charging an average $30 a ton.

Usage

On the question of using a or an before words beginning with h, see an

Origin

Middle English: weak form of Old English ān ‘one’.

a2

abbreviationā
  • 1(in travel timetables) arrives.

    用于旅行时刻表同arrives

    Penzance a 0915

    9点15分到达彭赞斯。

  • 2in combination (in units of measurement) atto- (10⁻¹⁸).

    (度量单位)同 ATTO-

  • 3British (with reference to sporting fixtures) away.

    〈英〉(比赛的安排)同 AWAY

    March 15 Sheffield United (a)

    谢菲尔德联队将于3月15日在客场举行比赛。

  • 4(used before a date) before.

    在…之前(用于日期之前)

    a1200

    1200年前。

ā
"a"Physics
  • Acceleration.

    〔物理〕加速度

A3

(also a)
nounā
  • 1The first letter of the alphabet.

    1. 1.1 Denoting the first in a set of items, categories, sizes, etc.
    2. 1.2 Denoting the first of two or more hypothetical people or things.
      suppose A had killed B
    3. 1.3 The highest class of academic mark.
    4. 1.4Chess Denoting the first file from the left, as viewed from White's side of the board.
    5. 1.5 The first fixed quantity in an algebraic expression.
    6. 1.6"A" The human blood type (in the ABO system) containing the A agglutinogen and lacking the B.
  • 2A shape like that of a capital A.

    in combination an A-shape
    See also A-frame, A-line
  • 3Music
    The sixth note of the diatonic scale of C major.

    1. 3.1 A key based on a scale with A as its keynote.

Phrases

  • from A to B

    • From one's starting point to one's destination.

      most road atlases will get you from A to B
      Example sentencesExamples
      • How else would you get someone from A to B unless you've used an airplane?
      • People who need to travel from A to B will take an alternative route.
      • We need to put all the other things to one side and get from A to B safely at the appropriate speed.
      • She said: ‘People will still be able to get from A to B - it may just take them that bit longer.’
      • The drivers are not concentrating and just going from A to B to distribute the goods.
      • Ask the ‘British Bobby’ for the nearest toilet or how to get from A to B, it is all part of his job.
      • It must also be rather boring and predictable sailing directly and single-mindedly from A to B to C.
      • As well as finding you the best way from A to B, the operators can also provide an emergency and breakdown service.
      • I wanted to show people how to get from A to B in your life.
      • You could go from A to B directly, walking fast, neglecting the scenery, or instead you could choose to take your time.
  • from A to Z

    • Over the entire range; completely.

      make sure you understand the subject from A to Z
      Example sentencesExamples
      • The person has to fit from A to Z or else they're just not wanted.
      • Going through your list of accounts from A to Z won't really work.
      • They could argue about who was smarter, who the teachers liked best, anything from A to Z they could argue about.
      • If you complete all the steps from A to Z, the mission is a success.
      • Most of my work has been in the comedy genre, so it's a dream role to get a chance to play a character that has a trajectory from A to Z.
      • Instead, the opposition wants an independent committee to oversee the election from A to Z.
      • It wouldn't be something I'd have to take from A to Z, point-by-point, and argue and describe.
      • If everything is explained to us, from A to Z, then even an idiot can grasp it.
      • The process moves from A to Z without cutting corners.
      • They moved in with a heavy barrage of speculation from A to Z.
  • plan A

    • One's original plan or strategy.

      plan A having gone horribly wrong, Ferguson used the interval to change his formation
      Compare with plan B
      Example sentencesExamples
      • That's plan A, but I've a number of other plans.
      • Why not just carry on with Plan A as if nothing has happened?
      • Plan A, to propose on Detonator, backfired when she saw the ride on the website and refused to go on it.
      • We can't even resort to Plan B these days because we haven't got a Plan A!
      • Business as usual - Plan A - is clearly not working.
      • You've got to still have a Plan B if Plan A doesn't work.
      • We had Plan A and Plan B and Plan C.
      • Plan A, business as usual, is no longer a viable option.
      • Plan A had been for me to travel with Connie on the train, but there were no seats available.
      • If their coaches are talking differently October 1, you'll know Plan A didn't quite work.
      • I don't know what plan A was, but it evidently failed.
      • Have a plan B in case plan A fails.
      • Fortunately, I have appealing contingency plans, but still first I'll apply myself to plan A with all my strength.
      • Plan A is actually just to turn up on the day and make it up.
      • You either continue with plan A, or you look at alternatives.
      • This is plan A; this is what I plan to do.
      • I think the only reason you're back now is because Plan A disintegrated and I'm your contingency.
      • However, since football is now a 16-man game, he can bring on talented substitutes if plan A is not working.
      • We had a review in the first week of the work to see if plan A was still the best way forward.
abbreviation
  • 1Ace (used in describing play in bridge and other card games)

    you cash AK of hearts
  • 2informal A level.

  • 3Ampere(s).

  • 4Ångstrom(s).

  • 5Attack (in designations of US aircraft types)

    an A-10
  • 6Answer.

    Q: What's the senator's zodiac sign? A: He's a Leo
  • 7(in personal ads) Asian.

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