Health officials say trials have gone smoothly and Australia could be the first country anywhere to start a mass immunization program.

VOA: standard.2009.08.25

And this spin is an intrinsic quality of the electron, it's a property that is intrinsic in all particles, just like we would say mass is intrinsic or charge is intrinsic.

自旋是电子的本征量，它是所有粒子的本征性质，就像我们说质量是本征的或者电荷是本征的。

麻省理工公开课 - 化学原理课程节选

That is why this says atomic number, but for most intents and purposes we can say this could be atomic mass.

那就是为什么这里说原子序数，但如果没有意图和目的,我们就说是原子质量。

麻省理工公开课 - 固态化学导论课程节选

Supporters of the plan say that, nevertheless, it will lay the foundation for a new kind of mass transportation in the United States.

VOA: standard.2010.02.15

We don't say anything about implicitly here, we're talking about a closed system, so there's no mass leaving the system.

我们不讨论,这是隐含条件，因为我们讨论的是孤立系统，因此系统没有物质流失。

麻省理工公开课 - 热力学与动力学课程节选

They are very light, that is to say, low mass.

很轻，也就是说，质量很小。

麻省理工公开课 - 固态化学导论课程节选