"It is time to do what is right, not for the next election, but for the middle class."

VOA: standard.2010.07.19

And I am not going to take the time to solve it because I think that is a waste of class time, but those are the three unknowns.

但我并不打算把解这几个方程,我觉得那会是浪费课堂时间，但那是三个未知式。

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What it means is I don't want to take unique time that we could be discussing other things in class by covering things that you could have read already.

这只说明我不想在课上单独花时间,来讲你们可能已经看过的东西,这个时间可以用来讨论其他内容

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Now, it's also the case that this is fundamentally what class this algorithm falls into, it is going to take exponential amount of time.

哪个种类的一个实例,这个问题的时间复杂度是指数级的，也就是当n上升的时候。

麻省理工公开课 - 计算机科学及编程导论课程节选