你去上历史课，在第三排坐下，而且在老师讲课的时候直视她。

You go to history class, sit in the 3rd row, and look squarely at the instructor as she speaks.

youdao

我第三排10号。

I am on the third row, No.10.

youdao

坐在第三排的那位年轻人将成为一位内科医生。

The young man sitting in the third row will be a physician.

youdao

Step three in our Lewis structure rules is to figure out how many electrons we would need in order for every single atom in our molecule to have a full valence shell.

路易斯结构规则的第三步是,找出让分子中每个原子的价壳层,都排满应该需要多少个价电子。

麻省理工公开课 - 化学原理课程节选

And that you might look at, for example, that first example, and say, man by this stage it was already sorted, yet it had to go through and check that the third element was in the right place, and then the fourth and then the fifth and then the six.

你可能会去看看例如第一个例子，然后要抱怨，到这里,它已经是排好序的了,但他还是得去遍历查看,第三个元素是不是在正确的位置,然后第四个，第五个，第六个。

麻省理工公开课 - 计算机科学及编程导论课程节选

So if we have a third, we can just introduce it like this and so things start to line up a lot more nicely.

所以如果我们有第三个，我们可以像这样引进它,这样代码就排得漂亮多了。

哈佛公开课 - 计算机科学课程节选