"The reason those vents have not been closed yet are two reasons." "To prohibit the buildup of hydrates and something called chatter.

VOA: standard.2010.06.08

And the reason that that's the case is, what we don't have, are two important things.

导致这样的原因是，我们有两件重要的事情没做。

麻省理工公开课 - 计算机科学及编程导论课程节选

Someone of you may know that there's been experiments in which, for one reason or the other, the two halves of the brain have been separated.

你们中可能有人知道,有些实验曾经，出于某种实验目的，将大脑分为两部分。

耶鲁公开课 - 死亡课程节选