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BNC: 5 COCA: 5

A

Related topics: Letters & punctuation
A1, a /eɪ/ noun (plural A’s, a’s)  
1. [countableC, uncountableU]SLA the first letter of the English alphabet 英语字母表的第一个字母
2. [countableC, uncountableU] the sixth note in the musical scale of C major or the musical key based on this note A音〔C大调音阶的第六音〕；A调
3  [countableC] the highest mark that a student can get in an examination or for a piece of work A级，甲级，甲等〔表示学业成绩优秀〕
 I got an A in French.
我的法语得了个A。
 Julia got straight A’s (=all A’s) in high school.
朱莉娅读中学时成绩全部是A。
→ A level
4. an A student American EnglishAmE someone who regularly gets the best marks possible for their work in school or college 优等生
Examples from the Corpus
an A student• I was an A student, on my way to medical school.
5  [uncountableU] used to refer in a short way to one of two different things or people. You can call the second one B 甲，A〔两个不同事物或人中的一个，另一个称乙（B）〕
 A demands £500, B offers £100.
甲方索要500英镑，乙方愿出100英镑。
→ plan A at plan1(5)
6  from A to B from one place to another 从一地到另一地
get/go from A to B
 Hiring a car was the best way to get from A to B.
租车是从一地到另一地的最好方法。
Examples from the Corpus
from A to B• An eagle looking down from above implies a threat whereas a heron flying from A to B suggests a more peaceable purpose.• First, good generalization from A to B can be readily explained in terms of mediation by the associate.• I, I showed him our product and I said we have to go from A to B with this project.• It doesn't have to be fancy - I just need a car to get me from A to B.• The wavelength of the light increases as it passes from A to B for two reasons.• The arrow will point from A to B in the functional dependency illustrated in the definition.• For at least fifteen hours a day they get us from A to B and take our body weight.
7  from A to Z describing, including, or knowing everything about a subject 从头到尾〔表示描述、涵盖或了解一个科目的全部内容〕
 the history of art from A to Z
艺术通史
Examples from the Corpus
from A to Z• Hewanted his whole oeuvre to be seen from A to Z without any cuts.
8. A34, A40 etcA40 etc A34 the name of a road in Britain that is smaller than a motorway, but larger than a B-road A34（主干）公路，A40（主干）公路等〔英国公路名称，介于高速公路和B级公路之间〕 → A-road
9. [uncountableU] a common type of blood A型〔一种常见血型〕
Examples from the Corpus
A• an A on the test• I was at a party, and a guy hit me on the head with an A & W Root Beer mug.• But inside, the A & P brimmed with unexpected abundance.• They were already passing the A & P on the way out of town.• The A & P grocery chain ran a laundry in Belleville for cleaning and repairing their employees' work clothes.
Related topics: Electricity
A2  
TPEthe written abbreviation of amp or amps amp 或 amps 安培 的书面缩写
a /ə; strong eɪ/ ●●● S1 W1 (also an) indefinite article , determiner   → re, aka, her, of, or, er, o o, eh, are
1  XXused to show that you are talking about someone or something that has not been mentioned before, or that your listener does not know about 一，一个〔用于未曾提及或对方不知道的人或物的名称前〕
 We have a problem.
我们遇到了一个麻烦。
 There was a hole in the fence.
篱笆上有一个洞。
 Suddenly they heard a loud bang.
他们突然听到砰的一声巨响。
→ the1
2  XXused to show that you are referring to a general type of person or thing and not a specific person or thing 〔用于泛指一类人或一类事物〕
 Would you like a sandwich?
来块三明治好吗？
 I want to train to be an engineer.
我想经过培训成为一名工程师。
 He’s a really nice man.
他真是个好人。
 Take a look at this.
瞧瞧这个。
 It needs a good clean.
这得好好清洗一下。
3  XXused before someone’s family name to show that they belong to that family 〔用于某人的姓氏前表明其属于这个家庭〕
 One of his daughters had married a Rothschild.
他有个女儿嫁给了罗斯柴尔德家的人。
4  XXone 一（个）
 a thousand pounds
一千英镑
 a dozen eggs
一打鸡蛋
 You’ll have to wait an hour or two.
你得等一两个小时。
5  XXused in some phrases that say how much of something there is 〔用于某些表示数量的短语〕
 There were a lot of people at the party.
许多人参加了聚会。
 A few weeks from now I’ll be in Venice.
再过几个礼拜我就在威尼斯了。
 You have caused a great deal of trouble.
你惹出了很多麻烦。
6  XXused to mean ‘each’ when stating prices, rates, or speeds 每一（个）〔用于表明价格、费用或速度〕
7  XXused before singular nouns to mean all things of a particular type 任一，每一〔用于单数名词前表示某一类的全部〕
8  XXused once before two nouns that are mentioned together very often 〔用于两个经常同时提及的名词前〕
9  XXused before the -ing forms of verbs when they are used as nouns referring to an action, event, or sound 〔用于表示动作、事件或声音的动词-ing形式之前〕
10  XXused before nouns that are usually uncountable when other information about the quality, feeling etc is added by an adjective, phrase, or clause 〔用于有形容词、短语或从句修饰的不可数名词前〕
11  XXused before the name of a substance, food etc to refer to a particular type of it 〔用于物质、食品等名称前表示某一类〕
12  used before the name of a drink to refer to a cup or glass of that drink 一杯〔用于饮料名称前〕
13  XXused before the name of a famous artist to refer to a painting by that artist 一幅…的作品〔用于著名画家的姓名前〕
14  XXused before a name to mean someone or something that has the same qualities as that person or thing 〔用于某人或某物的名字前指与其具有同样特性的人或物〕
15  XXused before someone’s name when you do not know who they are 某一，一位〔用于陌生人的姓名前〕
16  XXused before the names of days, months, seasons, and events in the year to refer to a particular one 〔用于某一年的日、月、季节和事件前，指具体的日子或事件〕
 USAGE: A, an
Before a word beginning with a vowel sound, use an: 读音以元音开头的单词前用an
an elephant
一头大象
an umbrella
一把伞
an obvious mistake
一个明显的错误
Use an before an 'h' that is not pronounced: 不发音的h前用an
an hour later
一小时之后
an honest explanation
如实的解释
Use a before a 'u' that is pronounced like 'you': u发you音时前面用a
a university
一所大学
a unique opportunity
一个千载难逢的机会
Use an before an abbreviation that is pronounced with a vowel sound at the start: 读音以元音开头的缩写前用 an
an SOS call
一个紧急求救电话
an MP3 file
一个MP3文件
Examples from the Corpus
a lot• "How does your arm feel?" "It still hurts a lot."• If you plan carefully, a trip to Europe doesn't have to cost a lot.• It's nice to meet you. Wendy's talked about you a lot.• She goes abroad on business quite a lot.• An awful lot of his customers are unhappy with his work.• I'm really glad to meet you. Betty's talked a lot about you.• He laughed quite a lot as he spoke.• I like her a lot, but I don't think I'm in love with her.• I used to walk a lot, but I've been very lazy recently.• I like the people a whole lot, but the pay isn't very good.• He really sweats a lot in hot weather like this.• Ask Susan - she knows a lot more about computers than I do.• The tickets were a lot more expensive than we expected.• I'm sure she has a lot more problems than I have.• John has lived in a lot of different places.• All the same, it is a lot of fun, and the warm weather is very pleasant.• Stevie Wonder is a black artist, but a lot of his music comes out pop.• I went out with quite a lot of men before I met Stuart.• The Big Three are making a lot of noise in hopes of gaining a political and competitive advantage.• As with most coupes there is not a lot of room in the back, even kids find it tight.• But that is true of a lot of subjects I did at O level.• A lot of tourists visit Venice in the summer.• The book contains a lot of useful advice about setting up your own business.• Helen looks as if she's lost quite a lot of weight recently - is she on a diet?• He knows a lot of weird people over in Nam.• She's changed a lot since she's been here.• I was surprised so few people were at the concert - I thought there'd be a lot there.
a-1 /ə/ prefix  
1  XXin a particular condition or way 处于某种状况；以某种方式
2  old use in, to, at, or on something 在…内[上]；往…
Examples from the Corpus
a-• atop
a-2 /eɪ, æ, ə/ prefix  
XXnot or without 与…相反；缺乏；不；没有
 amoral (=not moral)
不道德的
 atypically (=not typically)
非典型地
A* /ˌeɪ ˈstɑː $ -ˈstɑːr/ noun [countableC, uncountableU]  
the highest mark that a student can get in a GCSE examination A星级〔普通中等教育证书考试的最高得分等级〕
A1 nounA2a indefinite article
→10-16

→USAGE1a-1 prefixa-2 prefixA* noun
Chinese
Corpus
BNC: 5 COCA: 5
BNC: 5 COCA: 5
BNC: 5 COCA: 5

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