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

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。

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It had been left raised up to 4ft (1.2m) along a 0.6-mile (1km) section, about 300ft (91m) below the surface.

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When a section is highlighted, a preview of its contents float beneath the surface of the interface, scurrying to the top when their parent option is selected.

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