Secondly, we introduce a prepositional class-selection semantics, give the frame conditions of the character axioms of the systems.
其次，我们建立命题型的择类语义，给出描述上述系统的特征公理的框架条件。
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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