首先是序言部分，我在这节课一开始时就读了的。
First, there's this prologue that I started reading at the very beginning of the lecture.
序言部分对研究的缘起，研究的内容和主要方法作了介绍。
The preface includes the purpose, content and the main methods of the research.
序言部分，介绍了本课题的研究宗旨和意义以及国内外相关研究现状。
Preface gives an introduction of the purpose and meaning of this thesis and also reviews the relevant research situations at home and abroad.
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