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 margin edge 不能在此包含块的右 padding edge 之右。

youdao

Surprisingly, last does not force a clear to reposition any elements that follow; it merely sets the right margin to 0, which overrides the default right margin of 10 pixels in span-n.

令人惊讶的是，last并未明确强制重新配置其后的任何元素；它仅仅将右边距设置为0，这将覆盖span - n中10像素的默认右边距设置。

youdao

Right - Increase the generated box's top margin so that the top border edge is below the bottom margin edge of any right float boxes generated from previous source elements.

right -增加所生成框的上边框，以便上border edge处于由之前的源元素所生成的任一右浮动框的底margin edge之下。

youdao

Unlike earlier non-social ad units, they appear right in the Newsfeed, not along the right margin, making them a viable format for the all-important mobile environment.

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