作为功能语法中篇章功能的组成部分，主位结构分析是检验句子序列能否构成语篇的重要方法之一。
Thematic analysis, one important aspects of textual function in functional grammar, is a way of examining whether a sequence of sentences or paragraphs could constitute 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.
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