在这里，您将要为页面页脚留下大量的空间，以确保您的绘制不太接近底部边距(请参考清单7)。

Here, you're leaving a generous amount of space for the page footer to ensure that you're not drawing too close to the bottom margin (see Listing 7).

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因此，如果我们希望四边的内边距看起来是基本一致的，就需要减少顶部和底部的内边距。

Therefore, we need to specify less padding for the top and bottom sides if we want it to be perceived as being the same.

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这是将被清除盒的顶部边距扩展，将其向下推直到清理浮动的底部。

What this does is extend the margin on the top of the cleared box, pushing it down until it "clears" the bottom of the float.

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