The Russian empire is one of those empires that continued, arguably-- not arguably, it was the case-- after the four empires disappeared with World War I.

俄帝国可以说是,那些得以延续的帝国之一,这的确是事实,毕竟此前的四大帝国在一战中相继陨落

耶鲁公开课 - 欧洲文明课程节选

Already from this class if I told you that I gave you energies in some spectrum but they were off by a factor of four, what would you think? Maybe the Z is wrong.

从这节课开始,如果我告诉你我给了你,在某些光谱里的能量,但它们不属于四大元素之一，你会怎么想？也许Z是错的。

麻省理工公开课 - 固态化学导论课程节选

The pieces that we pulled off the shelf here were ultimately reduced to things like 4 loops and what we'll call functions and what we'll call abstraction; and all these fundamentals that at first glance might have some fairly RK and jargon associated with them.

我们可以把现有的课程,分为四大领域,以及应用型课程和抽象理论课程,乍一看，所有这些基础课程,都可能会和RK及与之相关的术语联系在一起。

哈佛公开课 - 计算机科学课程节选