At the preface, there were a brief introduction of the achievement obtained from the former researchers、the summarization of the studying purpose、meaning and research methods.
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Introduces the topics of this study cause, meaning topics, and research methods.
介绍了本研究的选题缘由、选题意义，以及研究方法。
Have introduced on the background and motivation, purpose and meaning, content and methods and research organization chart.
序章介绍了研究的背景与动机、目的与意义、内容与方法以及研究架构图。
This part briefly describes the research of background, current situation, purpose and meaning, content and methods.
简要阐述本论文的研究背景、研究现状、研究目的和意义、研究内容与方法等。
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