导言：对选题的缘起、研究背景及现状、选题意义的简单介绍。
Preface: a briefly introduction to the reason, background, present condition and value of the thesis.
全面阐述了本课题研究的背景、现状、目的和意义及自主学习的理论研究。
A comprehensive exposition of the background to the study of this subject, status, purpose and significance of the self-study and theoretical research.
本文绪论首先介绍了该课题的设计背景、设计意义及相关问题的研究现状。
In this paper, the exordium introduces the background, significance and the current achievement of the design on this subject.
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