And, one thing I'd like to add to it, and that is, and I told this to my recitation sections that when you do these quizzes, in spite of the fact that it might be trivial in some cases, make sure you carry the units through.

而我要在这基础上再加一条，我在我的背诵课上也讲过,当你考试时，尽管单位不重要，但我希望你能注意它们。

麻省理工公开课 - 固态化学导论课程节选

What I mean by that is, pick a simple set of values, and let's walk through it to see what happens. And this is useful because it's going to allow me to A make sure that I've got something that's going to terminate, it's going to let me make sure that in fact I'm doing the right kinds of updates.

原因你们知道的，好，模拟代码,我的意思就是,选出一系列的值来,然后模拟下代码的执行来看看结果,这很有用因为这让我确保我的程序在某个地方,可以终止，还会让我确保实际上我。

麻省理工公开课 - 计算机科学及编程导论课程节选

It's going to be absolutely critical that Congress acts over the next several months to make sure that we don't lose sight of the fact that even though the economy is now growing again -- almost 6 percent last quarter -- people have not started hiring again.

WHITEHOUSE: President Obama Holds a Town Hall in New Hampshire

We've insisted on and have received so far full cooperation from countries like Egypt and Libya and Tunisia in not only protecting our diplomatic posts, but also to make sure that we discover who, in fact, is trying to take advantage of this.

WHITEHOUSE: The White House

In fact, I asked him to take a couple of days to make sure that he was sure about this.

WHITEHOUSE: President Obama on the Resignation of Chief of Staff Bill Daley | The White House