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。
Let's leave out Chapter Two and cut to Chapter Three.
我们暂不看第二章，先看第三章。
Let's leave out Chapter Two and cut to Chapter Three.
我们暂不看第二章，先看第三章。
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