导论：概念、背景及意义。
对开展本论文研究的背景及意义、国内外研究现状等做了描述。
To carry out this study on the background and significance, status, etc. was described.
全文共分五个部分：第一部分，着重说明当前的研究背景及意义。
It is organized as follows. Section one illustrates the research background and goal.
引言部分，介绍了研究的对象、写作的背景及选题的意义。
In the introduction, the author explains the subject, background and significance of the research.
综述了本项研究提出的背景及研究的意义。
In addition, the background and significance of this research were summarized.
第一部分，简述了本论文研究的背景、意义，及研究的基本思路与方法。
The first section sketch the background, meaning, thinking and method of the study.
本文首先阐述了桌面保护系统的应用背景及重要实践意义；
This system is a kind of computer security protection software based on the USB key.
本文首先阐述了桌面保护系统的应用背景及重要实践意义；
This system is a kind of computer security protection software based on the USB key.
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