The fourth chapter is the extension of chapter two and three.
第四章是第二、三两章的延伸。
The second part, including chapter two and three, put forward the basis theory.
第二部分是论文的基础理论部分,由第二章和第三章组成。
And this article is divided into four parts: leadin, Chapter One, Chapter Two and Three.
全文分为导言,第一章,第二章,第三章共四个部分。
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