What is the function of the prepositional phrase?
这个介词短语的作用是什么？
In one sentence, at most one prepositional phrase is allowed.
在一个句子里，最多只能有一个介词短语。
If they are followed by a prepositional phrase, it must have a particular preposition.
如果后接介词短语，则必须用特定的介词。
If they are followed by a prepositional phrase, it must have a particular preposition.
如果后接介词短语，则必须用特定的介词。
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