And this is just a Newtonian expression of momentum, the product of the mass of the electron times its instant velocity.

这只是牛顿学上关于动量的表达，用电子质量,乘以瞬时速度。

麻省理工公开课 - 固态化学导论课程节选

unless it has really good quality or I think it's going to last me for a really long time.

除非它真的质量很好，或者我认为我真的会用很久。

SOHO的画廊 - SpeakingMax英语口语达人

With some degree of confidence, I'm working with a reliable spring and then I will get the mass of the elephant.

这时我就对弹簧有信心了,我用的是一个可靠的弹簧,我能测出大象的质量

耶鲁公开课 - 基础物理课程节选

We divide that by the mass, so 0.12 kilograms, that's the mass of a regulation baseball for the major leagues, and the velocity of the baseball is 42 meters per second. So, we can cross out our units doing our unit analysis.

我们用质量来除它，质量为0，12千克，这是大多数联赛规定的棒球质量,棒球的速度为42米每秒,所以，我们可以消去单位,来做单位分析。

麻省理工公开课 - 化学原理课程节选

And one of the cases that I've talked about probably be the most controversial is where babies were born with severe problems that not gonna be compatible with what the parents and doctors judge to be a reasonable quality of life.

我所讲过的例子中,下面这个可能是最具争议的,有些婴儿一出生就有严重的生理问题,他们无法如他们的,父母和医生所愿,用有正常的生活质量。

普林斯顿公开课 - 人性课程节选

This is going to have one-half mv squared where this is the mass of the electron.

有了电子的质量,就可以用1/2mv^2算出其动能。

麻省理工公开课 - 固态化学导论课程节选

You cannot tell the mass, because what you are doing now is appealing to the notion of mass as something that's related to the pull of the Earth on the object.

你无法测出质量,因为你现在所做的是把质量,用地球对物体的引力给替代了

耶鲁公开课 - 基础物理课程节选