This has no effect on the first paragraph or the float box defined within the first paragraph.
这对第一个段落或在第一个段落内定义的浮动框没有任何影响。
Optimum vertical constraint. A float box must be placed as high as possible within its containing block.
最佳垂直限制：浮动框必须被置于此包含块内尽量高的地方。
The clear property indicates which side or sides of an element's box may not be adjacent to an earlier float box.
clear属性表明了一个元素的框的哪一侧或哪些侧不必与之前的浮动框相邻。
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