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a

美 [ə]
英 [eɪ]
  • na.
  • n.英文字母表的第一字母;【乐】A音
  • art.冠以不定冠词主要表示类别
  • 网络从;按;一个
复数:a’s  复数:A's  复数:As  
a
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art.
1.
(用于可数名词或单数名词前,表示未曾提到的)一(人、事、物)used before countable or singular nouns referring to people or things that have not already been mentioned
a man/horse/unit
一个人;一匹马;一个单位
an aunt/egg/hour/x-ray
一位姑母;一颗鸡蛋;一小时;一张 X 光片
I can only carry two at a time.
我一次只能带两个。
There's a visitor for you.
有位客人找你。
She's a friend of my father's(= one of my father's friends) .
她是我父亲的朋友。
2.
(用于前有形容词或后有短语的不可数名词前)used before uncountable nouns when these have an adjective in front of them, or phrase following them
a good knowledge of French
精通法语
a sadness that won't go away
挥之不去的悲愁
3.
任何一;每一any; every
A lion is a dangerous animal.
狮子是猛兽。
4.
(表示为某一群体或职业中的一员)used to show that sb/sth is a member of a group or profession
Their new car's a BMW.
他们的新轿车是辆宝马。
She's a Buddhist.
她是佛教徒。
He's a teacher.
他是教师。
Is that a Monet(= a painting by Monet) ?
那是莫奈的画吗?
5.
(用于视为一体的两个名词之前)used in front of two nouns that are seen as a single unit
a knife and fork
一副刀叉
6.
(用于某些数字前,代替 one)used instead ofone before some numbers
A thousand people were there.
那里有一千人。
7.
(用于价格、数量、比率等)一,每一used when talking about prices, quantities and rates
They cost 50p a kilo.
其价钱是一公斤 50 便士。
I can type 50 words a minute.
我每分钟能打 50 个单词。
He was driving at 50 miles an hour.
当时他正以每小时 50 英里的速度驾车。
8.
像(某人)的人;…式的人物a person like sb
She's a little Hitler.
她是个小希特勒。
9.
(用于某人姓名前,表示说话者不认识此人)有个used before sb's name to show that the speaker does not know the person
There's a Mrs Green to see you.
有位格林太太要见你。
10.
(用于一星期中某天的名称前,表示具体某一天)used before the names of days of the week to talk about one particular day
She died on a Tuesday.
她是在某个星期二去世的。

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