The theory of theme and rheme is an important functional system where cohesion and coherence of discourse is studied.

主述位理论又是研究语篇衔接与连贯的一大功能系统。

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The theory of theme and rheme reveals the pattern of the structure of a text by dividing and analyzing theme and rheme in the text.

主位述位理论通过对语篇中句子主位、述位的划分与分析，揭示篇章的构成规律。

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The experiment and measurement in the essay tells that the theory of theme and rheme can help to improve senior students' English reading skills.

文中的实验与测量结果证明了：主述位理论有助于提高高中生的英语阅读能力。

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