各国语言都有其特殊的组织规律，主位述位是话语结构的重要组成部分。
Every language has its own special organizing rules. Theme and rheme play the most important roles in discourse structure.
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。
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.
主位结构包括主位和述位。
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