导航的结构使用锚元素的无序列表。

The structure of the navigation USES an unordered list of anchor elements.

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例如，概念主体和任务先决条件都允许公共块元素，如 p （段落）和 ul （无序列表）。

For example, both the concept body and the task prerequisites permit common block elements such as p paragraphs and ul unordered lists.

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对于这些用户，需要隐藏前面添加的无序列表，删除在内容部分中添加的边框和填充，恢复显示h2元素。

For those users, you need to hide the unordered list you added to the document, remove the borders and padding you added to your content sections, and restore the visibility of your h2 elements.

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