Because the prints were mass-produced and not original works, they were not costly.

VOA: special.2009.09.02

The closed system allows energy to transfer through the boundary but not mass.

闭系允许能量通过它的边界传递,但质量不行。

麻省理工公开课 - 热力学与动力学课程节选

If you look at the electrical force, the force of electricity, proton and electron or something, it's not proportional to the mass of either object.

如果你考察电作用力,即电现象产生的力,质子啊,电子啊,或者其它什么东西,这种力不和物体的质量成比例

耶鲁公开课 - 基础物理课程节选

We are all aware of that." Law Minister Veerappa Moily says India does not have a law to deal with a mass disaster.

VOA: standard.2010.06.10

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

Just last month,Mr.Blair was asked in a BBC interview what he would have done if he had known that Saddam did not hold any weapons of mass destruction in 2003.

VOA: standard.2010.01.02

We have not yet found a satisfactory answer to what's the mass of an object?

我们还没有一个令人满意的答案,物体的质量到底是多少

耶鲁公开课 - 基础物理课程节选

While there is advice aplenty on how to lose pounds or kilograms, a new study focuses on middle aged and older women who maintain normal body weight, or BMI (Body Mass Index) and do not diet.

VOA: standard.2010.03.30

So, clearly, mass is conserved, not mole numbers.

显然是质量守恒，而不是摩尔数守恒。

麻省理工公开课 - 固态化学导论课程节选

And since we are not expecting the mass of the particle to change, what we really are saying is the uncertainty in its velocity times the uncertainty in its position is greater than the ratio of the Planck constant divided by 2 pi.

因为我们不期望,粒子质量发生变化，我们说的是,它速度的不确定度,乘以它位置的不确定度,比普朗克常量,除以2除以圆周率要大。

麻省理工公开课 - 固态化学导论课程节选

And, I mean literally, mass, not mole number.

我想罗嗦一下，质量，而不是摩尔数。

麻省理工公开课 - 固态化学导论课程节选