The thesis consists of four parts except prologue and epilogue.
全文除引言和结语共分四个部分：第一部分，按揭概述。
This paper is divided into three chapters besides prologue and epilogue.
全文除序言和结语外，共分为三章。
That's exactly the same code as before, just wrapped with prologue and epilogue code.
这与之前的代码完全相同，不过增加了序言和尾声代码。
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