From the point of view of the informativeness and textual cohesiveness of preposed theme, the stronger its informativeness, the weaker its cohesiveness, and vice versa.

从前的信性和衔接性来看，前所传递的信新信性越，语篇衔接性越强，反之亦然。

The past research on the subject focuses on the macro-functions of preposing in discourse and few studies have touched upon its micro-functions.

以往研究局限于前句型在语篇中的宏观功能,微观功能很少探讨。