The text includes four chapters, they are the mains of the whole paper.
其中，“正文”部分由第一章至第四章构成，它们是论文的主体部分。
The full text includes a summary of the body of four chapters and conclusion.
全文包括摘要、正文四章和结语。
The text totally includes four chapters.
正文共包括四个章节。
The text totally includes four chapters.
正文共包括四个章节。
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