So if you take the test at 11:00 come here, but there is a plurality of rooms because we want to have some vacancies here.

因此如果你11：00过来参加考试，还会有很多的教师的,因此，我们希望有些空缺。

麻省理工公开课 - 固态化学导论课程节选

Now, I know you've had all this bonding in the orientation period, but I think that it's much better when you write a test for there to be some solid state defects known as vacancies in between the various people.

现在，我知道你们关系很融洽,在互相介绍的时间里，但是我想这样会更好,当你们在一起做一个测试,成为固体化学的不良产品,成为众多人当中的缺位。

麻省理工公开课 - 固态化学导论课程节选