You didn't know who wrote it, where, when, how, why, and someone says to you, "I want you to draw some conclusions about that piece of writing.

你不知道是谁，在哪里，什么时间，怎么样，为什么要写,然后你被要求对篇文章，做一个总结。

耶鲁公开课 - 旧约导论课程节选

So, you're treating healthy people and you're trying to prevent them from getting a disease and you don't know who's going to get it.

所以,你处治的对象是健康人群,要使他们远离疾病,但你不知道谁会被感染

耶鲁公开课 - 生物医学工程探索课程节选

When the uncertainty gets that big, you don't know which came first.

当不确定度到那么大的数值时，你不知道谁是第一个到达的。

麻省理工公开课 - 固态化学导论课程节选