In a Labor Day speech before union workers on Monday, Mr.Obama said it is time for lawmakers to end the debate over health care and pass legislation for him to sign.

VOA: standard.2009.09.08

And I apologize for taking you over, we'll come back to this next time, please go to the website to sign up for recitation for tomorrow.

抱歉有点拖堂了，我们下次会接着这里讲，请去网站,为明天的复述签到。

麻省理工公开课 - 计算机科学及编程导论课程节选

But we'll use this over time but the percent sign essentially gives you the remainder.

在以后我们会用到,%给你的是余数。

哈佛公开课 - 计算机科学课程节选

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

I differentiate a second time and check the sign, so the second order condition, I differentiate this expression again with respect to q1.

我们对它进行二次求导然后看符号,这个式子的二阶导数,就是一阶导数再对q1进行求导

耶鲁公开课 - 博弈论课程节选