Now,for this business to work, we must be able to produce a charming widow, with or without the beauty, as advertised."

VOA: special.2010.04.24

So, the total work that we can get out must be zero, out of the whole sum of them.

因此，我们可以从这两个热机,得到的总功，一定是零。

麻省理工公开课 - 热力学与动力学课程节选

It makes sense, right, because you know we got less work out and delta u is the same right, so it must be that less heat got transferred.

这是显而易见的，因为输出的功更少,且Δu相等，所以需要的热量更少。

麻省理工公开课 - 热力学与动力学课程节选

We must accept that our development model cannot be formulaic, that which works in Pakistan may not work in Peru.

VOA: standard.2010.01.06