页首和页尾可以让您编辑正文的外包装，而各种可用的标记符让您可以编辑正文本身的外观。
While the header and footer allow you to edit the wrapper of the content, the various tags available allow you to edit the appearance of the content itself.
注意，本例子中的代码包含一个页首和页左栏，且以为开始标记符指定了正文区域但无结束标记符。
Notice that the example code contains a page header and a left gutter. It also specifies the content area by opening the tag but not closing it.
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