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不定冠词-a / an . 1) 指人或物的某一种类。A monkey is a useful animal. 2) 指某一类人或物中的任何一个。Pass me a pencil, thank you. 3) 指“事物的单位”，如“每米”、“每斤”等。The meat is 30 yuan a kilo. (责任编辑：admin) |