新东方-柯林斯雅思备考词典

a

英 [ə]

词汇频率：

DET. 限定词

1. （用于首次提及或泛指某人或某物）一（个）
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.
双语例句
例：
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。
例：
He started eating an apple.
他开始吃苹果。
2. （用于指一类人或物，不需要特指）任何一（个）
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.
双语例句
例：
I suggest you leave it to an expert.
我建议你把它留给专家来处理。
例：
Bring a sleeping bag.
带个睡袋来。
3. 一种（用于前有形容词或后有修饰语的不可数名词前）
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.
双语例句
例：
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. 一种（用于物质名词前，特指某物的种类或成分）
You use a or an in front of a mass noun when you want to refer to a single type or make of something.
双语例句
例：
Bollinger 'RD' is a rare, highly prized wine.
Bollinger“RD”是一种罕见的、非常名贵的葡萄酒。
5. （用在量化词组中，如a lot, a little, a bit等）一......
You use a in quantifiers such as a lot, a little, and a bit.
双语例句
例：
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. （指某人或某物是一个团队、阶层或类型中典型的成员或部分）一（个）
You use a or an to refer to someone or something as a typical member of a group, class, or type.
双语例句
例：
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. （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）一个
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.
双语例句
例：
The interview took place on a Friday afternoon.
该面谈是在一个星期五下午进行的。
8. （用于说明某人的职业）一位 , 一个
You use a or an when you are saying what someone is or what job they have.
双语例句
例：
I explained that I was an artist.
我解释说我是一位艺术家。
9. 一（代替one，尤与量词hundred, hour, metre和分数词half, quarter, third合用）
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'.
双语例句
例：
more than a thousand acres of land.
一千多英亩的土地。
10. 每一（用于速率或比率的表达中）
You use a or an in expressions such as eight hours a day to express a rate or ratio.
双语例句
例：
Prices start at $13.95 a yard for printed cotton.
印花棉布开价为13.95美元一码。