I mean that's obvious. The mass, if you double the amount of stuff the mass will double.

这是显然的，还有质量，如果你把系统中物质的,数量增加一倍，质量也会增加一倍。

麻省理工公开课 - 热力学与动力学课程节选

What de Broglie is saying we can know the wavelength of any matter at all, as long as we know its mass and it's velocity.

通过德布罗意所说的,只要我们知道了,它的质量和速度，我们可以知道,任何物质的波长。

麻省理工公开课 - 化学原理课程节选