It demonstrates how a secondary heading creates a section, but lower-level headings must be fixed.
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。
2
If that node appears before any section-levelheading, it is placed in the output, and processing continues to the following node.
如果该节点出现在section级别的标题之前，则将它放到输出中，并继续处理后面的节点。
3
To make the top-levelheading really stand out, the example layout puts a page break and a horizontal line before the text. Here are the formatting choices used.