最简单的区别法就是一个有指定,一个没指定.举例:There's a cat in my room.我房里有只猫.(随便一只猫都可以)
The cat in my room is sleeping.(限定为你我都知道是我房里的那只猫.
何时用a/an,何时用the?A plane is a machine that can fly.中,plane前面用的
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