For instance, suppose you fold along the central vertical line, and think of the top row.

例如，假定你沿垂直中线折叠，且看看第一行的变化。

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However, a vertical line sitting perpendicular to the top and bottom of the canvas has more of a tendency to convey a sense of height.

然而，与画布顶端和底端垂直的竖线往往更适于传递高度之感。

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Line-box vertical constraint. A left float box's top margin edge may not be higher than the top padding edge of any line-box containing a box generated by an earlier element in the source document.

line - box垂直限制：左浮动框的上margin edge不能高于任何包含由源文档中前一元素生成的框的line - box的上padding edge。

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