Now the question you'd need to ask yourself is how do you know this didn't happen to you last night?

现在你要问自己的问题是,你怎么知道,昨晚你没发生这样的事？

耶鲁公开课 - 死亡课程节选

that you know it's not going to happen or you know it's not useful to do.

你知道这事没发生的可能，或者这么做并不会起到什么作用。

The thing is 课堂 - SpeakingMax英语口语达人

And yeah, I know you know how to do it, but let's think about what might happen if I wanted to do that.

对，我知道你们知道该怎么做，那么让我们看看如果我,想要完成的话会发生什么。

麻省理工公开课 - 计算机科学及编程导论课程节选

How do you know, not only that it didn't happen to you last night?

你怎么知道，只是昨晚没有发生？

耶鲁公开课 - 死亡课程节选

If you had genetic scans that were available for disease prediction, do you want to know everything that's going to happen to you in terms of susceptibility to disease?

如果我们有基因扫描技术,可以预测疾病,你是否愿意知道,你都可能会得什么病

耶鲁公开课 - 生物医学工程探索课程节选