天文学家们知道冥王星和海王卫一拥有几乎相同的体积、质量和密度。

Astronomers know that Pluto and Triton have nearly the same size, mass, and density.

《柯林斯英汉双解大词典》

所谓的电荷密度是指单位体积的电荷。

By the charge density we mean the per unit volume.

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制品外观平整、光滑、体积密度高，具有良好的导热性，节能效果优异。

Product exterior level off, smooth, high volume density, good thermal conductivity, excellent energy saving effect.

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轮毂电机要求体积小、转速高、功率密度高。

The main requests of the In-Wheel-Motor are small size, high speed and high power density.

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轮毂电机要求体积小、转速高、功率密度高。

The main requests of the In-Wheel-Motor are small size, high speed and high power density.

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