four-current density 四维电流密度
four-dimensional spectral density 四维谱密度
four-vector of current density 四维电流密度矢量
four dimensional current density 四维流密度
density of four colour reproduction 四色复制密度
The four grades of density are shown in these mammogram images.
图中展示了这四个密度等级。
Figures released by the Office for National Statistics show that population density in England is already almost double that of Germany and four times the figure for France.
根据全国统计局发布的数据来看，英国人口密度几乎是德国的一倍、法国的四倍。
In general, the purely mechanical effects of the pubescence depend on four main characteristics of the trichomes: density, erectness, length, and shape.
一般来说，柔毛的机械作用取决于毛状体的四个主要性状：密度、直立性、长度和形状。
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