"I know some question whether we can afford to act this year. But the unmistakable truth is that it would be irresponsible to not act.

VOA: standard.2009.06.13

What I just spent many lectures discussing is the fact that we can not know how far away an electron is from the nucleus, so we can't actually know the radius of a certain atom.

我花了这么多课时所讨论的正是我们,不可能知道电子离原子核有多远这一事实，因此我们不可能知道某个原子的半径。

麻省理工公开课 - 化学原理课程节选

I can't tell you everything that we will do, but I know you will like it.

我不能全部透露给你，但你肯定会喜欢的。

When 实战 - SpeakingMax英语口语达人

After logging into the course's website, you'll appear on the top left-hand corner as I just did with your actual names that we know exactly who we're working with and then what you can do is raise your hand sort to speak.

登录课程网站之后，你将被显示在,左上角，通过你们的真实名字,我可以知道我到底是在跟谁一起工作,然后你们可以做的是举手来回答问题。

哈佛公开课 - 计算机科学课程节选

We have no idea what this menacing contraption actually is supposed to look like or what it's actually intended to signify, but we can know, I think, with some certainty that it's not scrannel.

我们无从得知这个威胁性的装置,实际上是什么样或者要代表什么，但是我们可以通过一些并不细小的确切性得知。

耶鲁公开课 - 弥尔顿课程节选

I think you people know how we can say that with confidence.

我想你们肯定都知道我们为何如此确信

耶鲁公开课 - 基础物理课程节选

So you can actually say, how do I know which methods are associated with the class? For that, we can call dir. And what it does, is it gives me back a listing of all the things, dir all the methods, that are associated with it.

我们开始建立类了，我们得到了这些方法,因此实际上你可以说，我怎么知道，哪些方法是关联与这些类的？,为了解决这个问题，我们可以调用，这个方法的作用。

麻省理工公开课 - 计算机科学及编程导论课程节选

If we want to know the possibilities for spiritual growth, value growth or moral development in human being, then I maintain that we can learn most by studying our most moral,ethical,or saintly people.

如果想知道心灵成长的可能性，人类价值增长或道德发展的可能性，那我认为，我们可以研究,最道德或圣洁的人。

哈佛公开课 - 幸福课课程节选

So the events that I don't really know the details of, we can just call B1, B2, B3, up through Bn.

由于我不知道某些具体的生理过程,我们可以叫它B1 B2 B3一直到Bn

耶鲁公开课 - 死亡课程节选

There is no reference, in any of the tablets-- I don't know how much we can make of that because the tablets limit themselves to such limited kinds of things that maybe it doesn't prove anything, but in this case, I think it does.

在所有陶土碎片的文字中都没有注释,我不知道我们能够理解多少,况且陶土碎片可供记录的空间有限,也许它们不能证明任何东西,但在这里,我想至少可以证明一点

耶鲁公开课 - 古希腊历史简介课程节选

So taking advantage of the fact that we know S1 is equal to S2 I can simplify things by making S1* equal to S2*.

我们利用S1=S2这个等式,这样用S1*=S2*可以化简了

耶鲁公开课 - 博弈论课程节选

We know that because you can stretch i by whatever factor you like.

因为你可以让 i 伸长任意的倍数

耶鲁公开课 - 基础物理课程节选