Section three: chapter three: theory and proof section, the key part of this article.
第三部分：第三章，属于理论实证篇，这部分是本文的重点。
Chapter three, four and five are the focuses of this article.
第三、四和五章为本文的重点。
Chapter three and four is a core part of this article.
第三章和第四章是本文的核心部分。
Chapter three is also the emphasis of this article.
第三章也是本文的重点。
Chapter three is also the emphasis of this article.
第三章也是本文的重点。
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