And the change was, that in this case, if I'm doing a single search, I've got a choice.

这个改变是，在这种情况下，如果我要做单一检索，我就面临一个选择。

麻省理工公开课 - 计算机科学及编程导论课程节选

Freud's mistake, and it's--although I'm picking on Freud, it's not only Freud that runs this sort of argument.

弗洛伊德是错的，虽然我选择他做例子，不仅是弗洛伊德一个人持有这种论点。

耶鲁公开课 - 死亡课程节选

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

We're actually going to do one more clicker question to get started with today, and as we do, I'll explain something we're going to be trying today, which is a little bit of a friendly competition in terms of answering the clicker questions correctly.

我们将在开始讲授今天的课程之前,再多做一个选择题，我先来说明一下做这件事的原因，这实际上是一个,回答选择题的小比赛。

麻省理工公开课 - 化学原理课程节选