因为这些星系的质量分布在更大的区域，它们每单位体积的恒星数量比传统星系要少得多。
Because these galaxies' mass is spread out over larger areas, they have far fewer stars per unit volume than do conventional galaxies.
每单位体积粉末的质量，包括粒子之间的空气。
Mass per unit of volume in powder form, including the air trapped between the particles.
在物理学上，是以每单位体积的质量来鉴别物质。
In physics it is an identification of material by noting its mass per unit volume.
这些稀土磁体产生每单位体积的高磁能比大多数市售的永磁体。
These rare earth magnets produce a higher magnetic energy per unit volume than most commercially available permanent magnets.
事实上，每单位体积的燃油燃烧时，约需要有1万单位体积的空气通过滤清器。
In fact, each unit volume of fuel combustion, about 1 million to unit volume of air through the filter.
该技术的阿基里斯的脚跟似乎是它的低能量密度，或可以存储在电池每单位体积的能量量。
The Achilles' heel of the technology appears to be its low energy density, or amount of energy that can be stored inside the battery per unit volume.
遗传性球形红细胞增多症中，窦状隙被RBC塞满，球形红细胞的渗透性脆性增加，因为RBC每单位体积的表面积减少。
The sinusoids are packed with RBC's in this case of hereditary spherocytosis. The osmotic fragility of spherocytes is increased, because the RBC's have decreased surface area per unit volume.
堆积密度是指每单位重量的体积松散倾斜燃料。
Bulk density is defined as the weight per unit volume of loosely tipped fuel.
堆积密度是指每单位重量的体积松散倾斜燃料。
Bulk density is defined as the weight per unit volume of loosely tipped fuel.
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