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是一个介词词组，后面要跟名词结构，对比：她走的很慢，因为腿疼。
She walked slowly because she had a pain in her leg.
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短语动词由一个动词和至少一个介词组成。
The set consists of a verb and at least one preposition.
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短语动词由一个动词和至少一个介词组成。
The set consists of a verb and at least one preposition.
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