a
柯林斯词典
1. DET You use a or an when you are referring to someone or something for the first time or when people may not know which particular person or thing you are talking about. (用于首次提及或泛指某人或某物) 一 (个)
A waiter entered with a tray bearing a glass and a bottle of whisky. 一名服务员端着一个放有一只玻璃杯和一瓶威士忌酒的托盘进来了。
He started eating an apple. 他开始吃苹果。
2. DET You use a or an when you are referring to any person or thing of a particular type and do not want to be specific. 用于指一类人或物，不需要特指
I suggest you leave it to an expert. 我建议你把它留给专家来处理。
Bring a sleeping bag. 带个睡袋来。
3. DET You use a or an in front of an uncount noun when that noun follows an adjective, or when the noun is followed by words that describe it more fully. 一种 (用于前有形容词或后有修饰语的不可数名词前)
The islanders exhibit a constant happiness with life. 这些岛民表现出一种对生活的持久的幸福感。
4. DET You use a or an in front of a mass noun when you want to refer to a single type or make of something. 一种 (用于物质名词前，特指某物的种类或成分)
Bollinger "RD" is a rare, highly prized wine. 是一种罕见的、非常名贵的葡萄酒。
5. DET You use a in quantifiers such as a lot, a little, and a bit. 用在量化词组中，如(a lot), (a little), (a bit##bit)等
I spend a lot on expensive jewellery and clothing. 我在昂贵的首饰和衣服上开销很大。
6. DET You use a or an to refer to someone or something as a typical member of a group, class, or type. 指某人或某物是一个团队、阶层或类型中典型的一员或一部分
Some parents believe a boy must learn to stand up and fight like a man. 一些家长认为一个男孩必须学会像男子汉一样奋起战斗。
7. DET You use a or an in front of the names of days, months, or festivals when you are referring to one particular instance of that day, month, or festival. 用于某一天、某一月份或某节日前，特指在该天、该月或该节日发生的事件
The interview took place on a Friday afternoon. 该面谈是在一个星期五下午进行的。
8. DET You use a or an when you are saying what someone is or what job they have. 用于说明某人的职业
I explained that I was an artist. 我解释说我是一位艺术家。
9. DET You use a or an instead of the number "one," especially with words of measurement such as "hundred," "hour," and "metre," and with fractions such as "half," "quarter," and "third." 一 (代替)(one)
...more than a thousand acres of land. …一千多英亩的土地。
10. DET You use a or an in expressions such as eight hours a day to express a rate or ratio. 每一 (用于速率或比率的表达中)
Prices start at $13.95 a yard for printed cotton. 印花棉布开价为$13.95一码。
11. V →an informal or dialect word for have
they'd a said if they'd known
12. PREP →(usually linked to the preceding noun) an informal form of of
sorta sad
a kinda waste
13. SYMBOL for acceleration 加速度
返回 a
a /æn, æn/ (also an)
剑桥词典
- What is the usual pay for a job like this one?
- Suddenly a dog ran out into the road in front of us.
- The customer said she'd like this coat if it was a nicer colour .
- Colin told a joke about a postman , but it wasn't very funny .
- Shall I bring a bottle of wine with me?
a determiner (NOT PARTICULAR)
used before a noun to refer to a single thing or person that has not been mentioned before, especially when you are not referring to a particular thing or person一（个）（用于名词前，表示未曾提及的，尤其是非特指的人、事、物）
I've bought a car . 我买了辆汽车。
She's got a boyfriend . 她交了个男朋友。
There was a sudden loud noise . 突然发出一声巨响。
What a shame that you couldn't go to the party . 你不能去参加聚会，太遗憾了。
I heard a child crying . 我听见有个孩子在哭。
Is he a friend of yours (= one of your friends )? 他是你的朋友吗？
used to say what type of thing or person something or someone is
（表示人或物的类型）
She wants to be a doctor when she grows up. 她长大了想当医生。
This is a very mild cheese . 这是一种很清淡的奶酪。
Experts think the painting may be a Picasso (= by Picasso). 专家们认为这幅画可能出自毕加索的手笔。
used to mean any or every thing or person of the type you are referring to
（泛指所指类别中的任何一个）
Can you ride a bike ? 你会骑自行车吗？
A cheetah can run faster than a lion . 猎豹能跑过狮子。
A teacher needs to have a lot of patience . 做老师需要很有耐心。
used before some uncountable nouns when you want to limit their meaning in some way, such as when describing them more completely or referring to one example of them
（用于一些不可数名词前，在某种意义上起限定性作用）
I only have a limited knowledge of Spanish . 我只懂一点西班牙语。
He has a great love of music . 他酷爱音乐。
There was a fierceness in her voice . 她的声音中透着股凶气。
used before some nouns of action when referring to one example of the action
（用于某些行为名词前）一下；一次
Take a look at this, Jez. 杰兹，看一下这个。
I'm just going to have a snack . 我正要去洗个澡。
There was a knocking at the door . 有人敲门。
used when referring to a unit or container of something, especially something you eat or drink
（尤指饮食的）一份
I'd love a coffee . 我想来杯咖啡。
All I had for lunch was a yogurt . 午饭我只喝了一杯酸奶。
used before the first but not the second of two nouns that are referred to as one unit
（用于被视为一体的两个名词中的第一个词前）一副；一套；一组
a cup and saucer 一副杯碟
a knife and fork 一副刀叉
used before some words that express a number or amount
（用于某些表示数量的词前）
a few days 几天
a bit of wool 一点羊毛
a lot of money 很多钱
used in front of a person's name when referring to someone who you do not know
（用于不认识的人名前）有个，某一（个）
There's a Ms Evans to see you. 有位埃文斯女士找你。
used in front of someone's family name when they are a member of that family
（用于某人的姓之前，表示其为该姓家族成员）
Is that a Wilson over there? 那边那个人是威尔逊家的吗？
used before the name of a day or month to refer to one example of it
（用于日期、月份前）一个
My birthday is on a Friday this year . 今年我的生日是个星期五。
It's been a very wet June . 今年6月一直都特别潮湿。
例句
a determiner (ONE)
one一
a hundred 一百
a thousand 一千
a dozen 一打
There were three men and a woman. 有三位男士和一位女士。
used between a fraction and a unit of measurement
（用于分数和度量单位之间）
half a mile 半英里
a quarter of a kilo 1/4公斤
three quarters of an hour 三刻钟
six tenths of a second 0.6秒
used when saying how often something happens in a certain period
（指某事在特定时间段内发生的频率）每一（个），一
Take one tablet three times a day . 一日三次，每次一片。
I swim once a week . 我每星期游一次泳。
used when saying how much someone earns or how much something costs in a certain period
（指特定时间段内的收入或费用）一，每
She earns $100,000 a year . 她一年挣10万美元。
My plumber charges £30 an hour . 管子工每小时收我30英镑的维修费。
I pay £25 a week for my parking permit . 我的停车证费用是每周25英镑。 返回 a