以泊为单位的流体动力粘度与流体密度之比。通常用沱或厘沱作为运动粘度的单位。
The ratio of the kinetic viscosity of a fluid in units of poises to the density of the fluid.
数值模拟的束流密度与背景电子密度之比为0.125。数值模拟的结果说明，两者相符较好。
In this simulation. the density ratio of beam electron and background electron is 0.125.
结果指出，另一种胆固醇测试方法，并不比大多数普遍常用的方法，总胆固醇与高密度脂蛋白HDL之比更优越。
The results indicate that other methods for measuring cholesterol were not significantly better than the most commonly used test, the ratio of total cholesterol to HDL.
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