But if you don't actually do anything with it, -- it simply disappears, and, therefore, it's -- well done, classmate Number Two.

但是如果你的确是没有用它做任何事情，它只不过是看不见的，因此，它是-,做的好，第二号的同学。

哈佛公开课 - 计算机科学课程节选

Let's say that you have a classmate who's really obnoxious.

假设你有一个令人讨厌的同学。

I can't help but 课堂 - SpeakingMax英语口语达人

So she was roommate, was my classmate from high school.

因此她是我的室友，我的高中同学。

普林斯顿公开课 - 人性课程节选