A prepositional phrase is one where a preposition carries an object.
介词结构(也叫介宾词组)是由介词带着宾语构成。
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。
Text analysis proves that the semantic space of a prepositional phrase can set up a textual frame and further functions as a textual marker.
语篇分析证实，介词短语的语义空间可以营造语篇架构，行使语篇标记功能。
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