Opposite horizontal margin constraint. A left float box that has another left float box to its left may not have its right margin edge to the right of the containing block's right padding edge.
对立水平边框限制：如果一个左浮动框的左边还有另一个左浮动框，那么这个左浮动框的右marginedge不能在此包含块的右padding edge 之右。
Left - Increase the generated box's top margin so that the top border edge is below the bottom margin edge of any left float boxes generated from previous source elements.
left -增加所生成框的上边框，以便上borderedge处于由之前的源元素所生成的任一左浮动框的底margin edge之下。
We're declaring that subview's left margin should align to superview's left margin.
我们声明子视图的左边缘应该对准上海华的左边缘。
We're declaring that subview's left margin should align to superview's left margin.
我们声明子视图的左边缘应该对准上海华的左边缘。
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