The density for a flat object would be the mass per unit area.
一个平面物体的密度是每单位面积元的质量。
Low current density area is grey.
低电流密度处呈灰色。
The patch density of core area is smallest, next is the experimental area.
核心区的斑块密度最小，其次是实验区。
The patch density of core area is smallest, next is the experimental area.
核心区的斑块密度最小，其次是实验区。
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