主位推进模式理论是分析篇章段落中连续分句中主位、述位之间关系的一种理论，是分析篇章微观结构的重要手段。
Thematic Progression (TP) Theory indicates the relationship between themes and rhemes of different clauses in the hierarchy of a text. It is the best way to analyze the microstructure of a text.
第三章根据主述位理论和主位推进模式分析了新闻文本的主位选择和主位推进程序，量化分析是本节的主要研究方法。
Chapter three focuses on the analysis of theme choice and theme patterns of news according to the theory of Theme-Rheme and theme pattern, and quantitative analysis method is applied.
本章详细介绍了主位结构理论，并阐述了本文采用的六个主位推进模式，最后简要介绍了社论及其结构。
It also expounds the thematic structure theory, and the six thematic progression patterns adopted in this study. At the end, it briefly explains editorial and its structure.
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