在单位体积材料中包含位错的长度，或者说在材料内部任意单位截面上位错线的根数。

The total dislocation length per unit volume of material, alternately, the number of dislocations that intersect a unit area of a random surface section.

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定距尺度(interval)—在定距尺度中，任意两个相邻测量单位之间的距离(也称为间距)是相等的，但零点是任意的。

Interval - an interval scale is a scale of measurement in which the distance between any two adjacent units of measurement (also known as intervals) is the same, but the zero point is arbitrary.

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您可以使用任意CSS可接受的单位指定宽度。

You can use any metric that is acceptable in CSS for specifying the width.

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You can pick your unit vectors, or what are called basis vectors, any way you like.

你可以任意选取单位矢量,或者也可以叫做基矢量,这都随便你

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