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.
因此，可以通过密度求一个平面物体的质量。
一个平面物体的密度是每单位面积元的质量。
The density for a flat object would be the mass per unit area.
相似质量的恒星可能在大小上有所不同，因为它们有着不同的密度。
Stars with similar masses might not be similar in size because they have different densities.
等级，级别以尺寸，质量或密度衡量所处的位置。
结论本法快速准确、精密度好，可作为控制脑心通胶囊质量的方法。
CONCLUSION the method is rapid, accurate and can be used for the drug quality control.
质量流量的数据可借助于密度计而获得。
Mass flow information can be secured by using a densitometer.
体育课密度能从一个侧面反映一堂课的教学质量。
The exerciae density in a sports class is closely relevant to its quality.
高效液相色谱法简便快速、精密度高、准确度好，可用于该药的质量控制。
HPLC is simple, quick, high precise and accurate for the quality control of Jiedu Capsules.
高效液相色谱法简便快速、精密度高、准确度好，可用于该药的质量控制。
HPLC is simple, quick, high precise and accurate for the quality control of Jiedu Capsules.
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