So let's do a quick clicker question, and you tell me how many valence electrons does fluorine have? Remember, valence electrons are different from core, they're only the outer-most electrons in the outer-most shell.

那么让我们来做一个小选择题，请大家来告诉我,氟有多少个价电子，要记得，价电子与芯电子不同，它们是在最外壳层的最靠外面的电子。

麻省理工公开课 - 化学原理课程节选

I don't have to go read what it printed out in the screen. This has returned a value that I can use. Because I could do a test to say, is this a return value? If it's not, I'll do something else with it. So the binding is still there, it simply doesn't print it out.

我不想读到屏幕中打印出来的这行字,程序返回过一个我能够使用的值,因为我可以做个小测试，来说明这是否是返回的值，如果不是，我可以做一些其它的事,而这个绑定依然在这儿，没有打印任何东西。

麻省理工公开课 - 计算机科学及编程导论课程节选

I just want to make a few small points that indicate how that works.

我在此举个小例子来作一个具体说明

耶鲁公开课 - 古希腊历史简介课程节选

Let's do this little trick again.

我们再来做个小游戏。

耶鲁公开课 - 新约课程节选

All right. Now an insertion, sort of discursus.

好了,现在咱们来个小讨论

耶鲁公开课 - 聆听音乐课程节选

Well, let's try it. Let's try a little test. OK?

不过我们还是来试试吧，做个小测试怎么样？

麻省理工公开课 - 计算机科学及编程导论课程节选

The question was how many rabbits do you have at the end of a year? At the end of two years? At the end of more than that number of years, and so. We can do this with the following level definition. We're going to let pairs of 0, the number of pairs at month 0, actually it would not be it would be 1.

在下一个月末的时候让我们假设,这2只小兔子也有了后代,同样是一公一母,问题是一年后你会有多少只小兔子？,两年后呢？更多年后呢？,我们可以用接下来的等级说明来解释，在第0个月有0对兔子。

麻省理工公开课 - 计算机科学及编程导论课程节选