清单2是简单概念的迁移路径，包含多个二级标题。
Listing 2 is a sample migration path for a simple concept, with multiple secondary headings.
它示范了二级标题是如何创建节的，而级别更低的标题必须修改。
It demonstrates how a secondary heading creates a section, but lower-level headings must be fixed.
要精心设计网页，把因特网资源组织分类规范化，要设计好一级标题和二级标题。
We should design the Homepage carefully to make the Internet resources organized, divided and standardized, and we should also design the first class subject and the second class subject.
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