We have, for example, bomb drills just in case something happens people think it's right When thing happens once and you move on, go back to life, just as something goes wrong and then you move on.

例如，我们有，炸弹演习以防发生什么事情,人们认为这是应该的,发生了一件事，你要继续正常的生活，正如某事出了点问题，然后你继续前行。

普林斯顿公开课 - 人性课程节选

And something that's happened in the past that's continuing to happen.

或者在过去发生的某事，现在仍在继续。

I've been 课堂 - SpeakingMax英语口语达人