a (用于可数名词或单数名词前，暗示不曾提到的)一(人、事、物)
；用于前有形容词或后有短语的不成数名词前；任何一；每习语①from A to B
从一地到另外一地 from one place to another
句子：For me a car is just a means of getting from A to B.
在我眼里，汽车只不外是从一地到另外一地的代步东西。
②from A to Z
从头至尾；完全地；彻底 including everything there is to know about sth
He knew his subject from A to Z.
他知晓本身的学科。
2. an
(指初度说起或非特指的人或物)一(个)；(一类人或事物中非特指的)任何一(个)；(用于前加形容词或后加润饰语的不成数名词以前)一(种)
句子:
a (an) indef. art. 一个
通经常使用于单数可数名词以前，泛指某类人或事物中的一个。
①My friend needs a bilingualdictionary.
我的朋侪必要一本双语辞书。
②Would you
like a sandwich?
要来份三明治吗？
③There is a bird sitting in the tree.
树上卧着一只鸟。
3.apple 苹果
句子：
①I want an apple.
我想要一个苹果。
②Penny's only son was the apple of her eye.
彭妮的独子是她的心肝宝物。
n.
the apple doesn't fall/never falls far from the tree
( saying, especially NAmE ) 有甚么样的怙恃就有甚么样的后代；言传身教
a child usually behaves in a similar way to his or her parent(s)
①the
apple of sb's eye
心肝宝物；掌上明珠
a person or thing that is loved more than any other
②apples and oranges
( NAmE ) 苹果橘子两回事；截然分歧 used to describe a situation in which two people or things are completely different from each other
③They really are apples and oranges.
他们确切是迥然分歧。
④as American as apple pie
典范美国式的；隧道美国式的 used to say that sth is typical of America
⑤a rotten apple
带来卑劣影响的人；害群之马 one bad person who has a bad effect on others in a group
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