论文的主要内容主要包括以下几个方面：首先是关于大学生休闲教育的相关概念的介绍。
This thesis mainly includes the following contents: Firstly, the thesis introduces the conceptions of college students 'leisure education.
论文的主要内容包括以下几个方面：首先介绍了DTMF编解码技术和电力线载波技术。
The major content of this paper includes some following aspects: First, introduces DTMF coding technique and power line carrier technology.
论文介绍了地铁路网规划的主要内容，并对地铁路网规模进行了探讨，提出了合理路网规模的概念。
Main contents of Rail Transit plan are firstly introduced in this paper, Rail Transit network scale is also discussed and the concept of rational network scale is introduced.
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