Everything that we know indicates that, first of all, our interception was perfectly legal.

VOA: standard.2010.08.09

OK, so now the question is, how do we know the first place that this is a suitable reductant?

好的，现在的问题是，我们如何能知道第一步中,镁是一个合适的还原剂？

麻省理工公开课 - 固态化学导论课程节选

We know that the first colony that the Greeks established was in the Bay of Naples on the island of Ischia.

我们知道希腊建立的第一个殖民地,是在那不勒斯湾的伊斯基亚岛

耶鲁公开课 - 古希腊历史简介课程节选

"Right now we have a lack of information on this so that first we have a policy to make our customer know - not something like gambling - it's very dangerous for them so that we have to make a seminar for customers first."

VOA: standard.2010.07.21

We know, from the very first lesson of the class last time, that no one should choose these strategies.

从上堂课中,我们学到了,不要采用这类策略

耶鲁公开课 - 博弈论课程节选

The first problem set will be posted shortly, and that means, you know, we want you just to get going on things. Don't worry, we're going to make them more interesting as you go along.

第一个问题的提出会很快让你们熟悉，意思是说，你们懂的，我们希望你们尽管去放手干，别担心，在你进行的同时我们会,让它们变得更有趣儿。

麻省理工公开课 - 计算机科学及编程导论课程节选

So, we have beryllium in the first case here, it has four electrons, that's how we know it's beryllium, boron has five electrons.

那么我们将铍作为第一个例子，它有四个电子，这也是我们为什么能知道它是铍的原因，硼有五个电子。

麻省理工公开课 - 化学原理课程节选

We know that there are some students here who don't have roommates but the majority of our first year students have roommates.

我知道，在这里的有些学生,还没有室友,但是大多数的大一新生,是有室友的。

普林斯顿公开课 - 人性课程节选

So first, let's start with the one that we already know, and make sure that it still works, starting from here, mainly our isolated system.

首先，我们从我们已知的一个例子入手，看看这个判据是否正确，从绝热系统出发。

麻省理工公开课 - 热力学与动力学课程节选

First, we know that it's not true that everything is learned.

首先，我们知道,一切都是习得的，这个观点是错误的。

耶鲁公开课 - 心理学导论课程节选

The first that we need to know the energy of the photon that's incident on our gaseous atom.

首先，我们需要知道,入射到气体原子的光子的能量。

麻省理工公开课 - 化学原理课程节选

I suppose the first apparently historical event that we know something about is the first Olympic Games, which according to Greek tradition were held in 776 B.C.

我认为第一个已知的重大历史事件,就是第一次奥林匹克运动会,根据希腊人的口头传述,那是发生在公元前七百七十六年

耶鲁公开课 - 古希腊历史简介课程节选