例如，质子的质量比电子的质量重1836倍。

The mass of proton, e. g. , is 1836 times heavier than the electron mass .

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例如，质子的质量比电子的质量重1836倍。

The mass of proton , e. g. , is 1836 times heavier than the electron mass .

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大型工件因质量重、体积大，进行球面加工时费时、费力。

It will take great time and plentiful works when machining large-sized workpiece spherical surface because of its heavy weight and big cubage.

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He goes back and redoes the calculation, only in this case he says what I am going to do is I am going to redo the calculation for helium, but I am going to consider not just the mass of the electron but the reduced mass of the system.

他回去重新做了计算，仅在这种情况下他才会说说我将要,为氦重做计算，但我认为,不只是电子的质量,还有系统质量的减少量。

麻省理工公开课 - 固态化学导论课程节选

But he also realized that when they did hit something what they hit what unbelievably massive but also that that mass was concentrated So eventually, this is what we have come to call the nucleus of an atom.

碰到的一定是十分重的东西,而且那些质量,要聚集在非常非常小的空间内,这个就是我们称作,原子核的东西。

麻省理工公开课 - 化学原理课程节选