摘要：一种虚词.不能单独作句子成分.它只有跟它后面的宾语一起构成介词短语.才能在句子中起作用.有:in, on, under, with, behind, about, near, before, after, for, to, up, down, from, in front of, out of, from-to-, at the back of-

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