English → Chinese
a /BrE ə, 
eɪ , AmE eɪ, ə /; before a vowel or silent ‘h’,
an /æn, ən/
▶[A / an, one, and the], ▶[Countability] indefinite article
1 (before countable or singular nouns) 一（个）;
a horse 一匹马;
an aunt/egg 一位姑母／一个鸡蛋;
a man came out of the room 一名男子从屋里走出来;
I'll have a think about it 我要想一想这事
2 (before uncountable nouns with adjective) [用于带修饰语的不可数名词之前];
a good knowledge of French 对法语的精通;
a sadness that won't go away 挥之不去的悲伤
3 (any) 任何一个;
I haven't got a thing to wear 我没衣服可穿;
she didn't say a word 她一言不发
4 (each of a species) 每一个;
a lion is a dangerous animal 狮子是危险的动物
5 (indicating membership of a group) [表示某一类中的一员];
is that a Monet? 那是一幅莫奈的画吗？
6 (before two nouns forming a unit) [用于构成一个单位的两个名词之前];
a knife and fork 一副刀叉
7 (with numbers) 一;
a hundred 一百;
a quarter of an hour 一刻钟;
half a cup/spoonful 半杯／半勺
8 (per) 每;
twice a day 每天两次
9 (someone like) 类似…的一个;
It doesn’t take an Einstein to solve this problem. 解答这个问题不需要一个爱因斯坦那样聪明的人。
10 (a certain) 某个;
a Mr Smith telephoned 有位史密斯先生来过电话
11 (with days) [表示星期中的某一天];
he died on a Monday 他是在一个星期一去世的