dimensionless ratio
... diesel engine柴油机 dimensionless ratio无量纲比值 displacement排水量 ...
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而且我认为人们也会开始考虑，像电子的质量对质子的质量的比值，也许其他无量纲的常数也在发生变化。
And I think people would start looking to see, well, maybe other dimensionless ratios like the ratio of the mass of the electron to the mass of the proton are changing.
youdao
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