But the head of UNICEF, Anthony Lake,says: "Unless we all work harder, there may still be fifty-six million children out of school in two thousand fifteen."

VOA: special.2010.05.20

But I think, as we think it all through we have to conclude it doesn't work. Okay.

但是我认为，我们考虑了一遍,给出的结论是它说不通，就到这里。

耶鲁公开课 - 死亡课程节选

Convention, OK, this negative sign is just a pure convention. You just got to use it all the time. If you use an old textbook, written when I was taking thermodynamics, they have the opposite convention, and it's very confusing. But now we've all agreed on this convention, and work is going to be with the negative sign here.

系统对外界做功的符号为负,这就是我们,在本课中的规定，纯粹出于统一符号的需要，有些教科书中，可能会使用相反的符号规定,注意不要混淆了，这门课上,我们将一直使用。

麻省理工公开课 - 热力学与动力学课程节选

But at this point,all the evidence that we see indicates that they will work out these differences.

VOA: standard.2009.12.12