The research was to look back firstly, and made a corresponding definition of key concepts.
首先对国内外的研究作了一番回顾，并对重点概念作了相应界定。
Therefore, the preface mainly explains the research background and meaning of this paper, as well as the definition of key concepts, and research train of thought and methods;
其中，绪论部分主要对本文的研究背景和意义、主要概念的界定、研究思路及研究策略等进行了阐述；
In the Introduction, the author of the study and the significance of this issue for a description of the status of academic research, and this involved the definition of key concepts.
在导论中，笔者对研究这一问题的意义及学术界的研究现状进行了说明，并对本文中涉及的关键性概念进行了界定。
In the Introduction, the author of the study and the significance of this issue for a description of the status of academic research, and this involved the definition of key concepts.
在导论中，笔者对研究这一问题的意义及学术界的研究现状进行了说明，并对本文中涉及的关键性概念进行了界定。
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