The four grades of density are shown in these mammogram images.
图中展示了这四个密度等级。
The storage density of a disk medium; storing four times the amount of information per disk as single density.
磁盘介质的存储密度，在这种密度下磁盘的信息存储量是单密度盘的四倍。
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。
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