问题描述：
英语中,同样表示数量"1"的"a"和"an"该怎样区别?
比如:I have a pencil.
:I have an eraser.(这句可能不对,不看也罢)
:The teacher erases the sentence with an eraser.
比如:I have a pencil.
:I have an eraser.(这句可能不对,不看也罢)
:The teacher erases the sentence with an eraser.
问题解答：
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