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 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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