densities
n.
密集( density的名词复数 );
稠密;
密度（固体、液体或气体单位体积的质量）;
密度（磁盘存贮数据的可用空间）;
例句:
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What are the densities of other liquids and semisolids?
来自SA
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The range of densities of interest is about 3.5.
有用的密度范围为3.5左右.
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Densities presumably can be probed by radar.
利用雷达也许还能探测出气体的密度.
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Finally, the positive column is reached where electrons and ions have equal densities.
最后到达的区域是正柱区,这里,电子和离子具有相等的密度.
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How do their densities compare with that of water?
来自SA
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The cougar is territorial and survives at low population densities.
来自BBC