第一部分引言主要介绍了本文选题的目的和意义、研究内容、研究方法、拟解决的主要问题。
The first part introduction introduces the purpose and significance of this topics, content, research methods and main problem to be solved.
这也是本论文研究的主要内容和拟解决的关键问题。
These are also the main content of research and issues discussed in this paper.
本文主要研究门槛图和拟门槛图的结构特点，并在此基础上解决了这两类图中的一些优化问题。
In this paper, we mainly do some research on threshold graphs and quasi-threshold graphs, solving several optimization problems on the basis of their special structure.
本文主要研究门槛图和拟门槛图的结构特点，并在此基础上解决了这两类图中的一些优化问题。
In this paper, we mainly do some research on threshold graphs and quasi-threshold graphs, solving several optimization problems on the basis of their special structure.
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