亦即是字面设计上的上升笔划线到下降笔划线间的距离。
Also, it is the distance between the ascender line and the descender line of a typeface design.
w——单字字符(a到z、a到z、0到9以及下划线)。
W — a word character (a through z, a through z, 0 through 9, and underscore).
属性包含，但该引用往往在打印时以内联形式表示，可能以斜体或下划线格式表示，也可能作为到书目的热链接出现(如果以HTML产生)。
The attribution contains a, but that citation will likely be rendered inline when printed, perhaps in italics or underlining, or will appear as a hotlink to the bibliography if rendered in HTML.
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