介绍研究缘起，重点对研究中容易引起歧义的概念进行了约定。
Introduction. This part gives an account of the origin of the research and centers on the definition of concepts which are ambiguous.
导言部分主要论述了本文的研究缘起、意义、学术前史、主旨与价值。
The preface mainly dwells on the study origin, meaning, previous study, main idea and academic value.
本论文首先介绍研究缘起、研究方法和研究背景，忠实地描述研究的过程。
The thesis starts from the origins, methods and procedures of the research.
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