You take the third one, and you go from one to the other, and you see whether heat flows, when you touch one object, the middle object, between those two objects.

第三个物体就可以作为温度计,将它与第一个物体接触，再与第二个物体接触，观察它们之间热量流动的方向。

麻省理工公开课 - 热力学与动力学课程节选

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

The first possibility was the claim was, Nobody believes that they'll ever cease to exist as a person.

第一个可能是，没有人相信自己会作为个人而死亡。

耶鲁公开课 - 死亡课程节选

The typing coming from here is going at that rate, being Stanford alumni, of course the first thing you could type here would be Shakespeare.

打字的速度就是这样，作为斯坦福的校友，我想大家能够想打出的第一个便是，莎士比亚。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

So this is to test whether a list is a palindrome.

我们可以把1放到数组里面作为第一个元素。

麻省理工公开课 - 计算机科学及编程导论课程节选