Because we chose to float the sidebar, there comes a point when the sidebar will flip under the main content area when the width of the viewport is too narrow.
因为我们选择让边栏浮动，所以当浏览器窗口的宽度太窄时，边栏会出现在主内容区域下面。
The main point to take away here is that you shouldn’t stuff all your important content at the top because you fear that users won’t be able to find them otherwise.
这里需要重点指出的是，你无需因为害怕用户“不会下拉页面寻找”而将所有重要内容堆砌在页面顶部。
In reading such a complex sentence, clause or clause must first find out where to start, where the first end, understand the main point, finally the clause content clause together.
在阅读这样的复杂句的时候，首先要找出主句或从句从哪儿开始，到哪儿结束，首先理解主句的意思，最后再把从句的内容与主句综合起来。
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