阐述了研究的缘起、研究思路与方法，并对本研究进行了几点说明。

We set forth mainly about the reasons, thoughts, methods of this research, and also some explanations for this research.

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本文第一章，介绍研究背景与意义，国内外研究现状及研究思路与方法。

First, it includes the research background and significance, the current research both home and abroad, also introduce the research method.

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概要介绍了论文的选题缘由、文献综述、研究目的及意义、研究思路与方法。

This paper briefly introduced the reason of choose the theme, expiation of prevention research, research Purpose and research ways and methods.

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