I realized that all of us should really know how to do it.

我意识到我们都应该真正学习如何去做。

youdao

I don't know how a vampire should be, I don't know what that is.

我不知道吸血鬼应该是什么样的，我也不知道它究竟是什么。

youdao

That's how I came to know a few things it might have been easier not to know, stories that did nothing for my peace of mind, the kind of news an egotist should always take care to avoid.

我开始逐渐意识到有些事情你不去了解可能会使你的心情感觉轻松些，有些事情对我宁静的心境不会有丝毫的帮助，对于一个自我主义者，总是应该有意回避那种消息的。

youdao

I think you should take the lab sometime, but I don't know how many semesters that you have to take.

我觉得你们应该是不是地去做几次实验,我不太清楚你们要上多少个学期的课

耶鲁公开课 - 基础物理课程节选

No one can say for certain how this change will end, but I do know that change is not something that we should fear.

WHITEHOUSE: President Obama Speaks to the People of Brazil