First, in preface, it introduces the research background and meaning.

首先，在前言中介绍了文章的研究背景和意义。

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The first chapter studied the research background and meaning of Performance Assessment for appraisal firms.

第一章是资产评估机构绩效考核评估研究的背景和意义。

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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；

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