前言介绍了选题的原因、目的、意义及论文的大体框架。
The foreword introduced the selected topic reason, the goal, the significance and the thesis roughly the frame.
前言部分说明论文选题的原因、意义，论文写作的过程及材料来源，论文所采用的研究方法，以及致谢。
The preface includes the reasons and significance that I choice this thesis, the procedure of composing, the sources of data, the method of studying and acknowledgement.
文章第一部分为概述，概括介绍论文选题的原因及意义，当前国内外研究该领域的主要趋势及论文研究的主要内容和主要方法。
The first part contains an overview of the causes and significance of papers, the domestic and international trends in the field of research papers and the main content of papers.
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