On the vertical dimension, we distribute extra space in a ratio of (1, 4, 2) corresponding to (top margin, button itself, bottom margin).
在垂直方向上，按照与(上边距，按钮本身，下边距)对应的(1,4,2)的比例分配额外空间。
Containing block vertical constraint. A left float box's top margin edge may not be higher than the containing block's top padding edge.
包含块的垂直限制：左浮动框的上marginedge不能高于包含块的上padding edge。
A gutter margin setting adds extra space to the side margin or top margin of a document that you plan to bind.
装订线边距设置将为要装订的文档两侧或顶部边距添加额外的空间。
Equivalently, it means how much the first (left or top) margin will grow.
同样，这意味着第一个边距（左边距或上边距）将增长多少。
Equivalently, it means how much the first (left or top) margin will grow.
同样，这意味着第一个边距（左边距或上边距）将增长多少。
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