它构建一个表格式的公告列表，这将用在公告区块内容变量中。
It builds a tabulated list of announcements for use in the announcement block content variable.
导航区通常都是具有相同高度和宽度的区块，因此访问者感觉内容能被轻松引导。
So that visitors perceive content as being easy to navigate, the navigation is often structured with blocks of the same height and width.
第一个例子通过调整内容区块的宽度来适应，第二个例子则调整空白区域大小。
The first example in each set alters the width of the content according to screen width, while the second screenshot uses varying widths for the white space.
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