答：主题是按单一题目范围组织的一段信息。
A: a topic is a chunk of information organized around a single subject.
由于主题本身范围宽泛并涵盖了很长一段历史时期，所以你需要对选择作为报告内容的信息有所区别。
The themes themselves are very broad and cover a long period of time, so you will need to exercise some discrimination in the information you choose to present.
本文讨论了基于弧段的多边形自动组织，这种方法所需信息少，适应范围广。
Automatic organization of polygon only based on arc is discussed in this paper. This method needs little information, and is widely used.
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