重点是他们都知道什么，是什么时候知道的。

It's about what they knew and when they knew it.

youdao

无论天晴还是下雨，他们都飞得又远又广；这儿的整个牛蒡林，里里外外，他们都知道。

They fly far and wide, in rain and sunshine; they know the whole forest here, both within and without.

youdao

看上去他们都知道：社区是真正重要的。

It seems they all know: it's the community that matters.

youdao

We have to account for that in some way because we know that they don't have identical average valence electron energies.

我们需要从一些方面来解释一下,因为我们都知道,他们没有相同的,平均价电子能。

麻省理工公开课 - 固态化学导论课程节选

But I mean, yeah, I don't know. They are like teenagers after all really, the same as usual.

但我的意思是，我不知道。他们毕竟都是青少年，跟普通人一样。

有趣的留学生活 - SpeakingMax英语口语达人

Some people don't even know what a dividend is, they just think of stock as something whose price goes up.

有些人甚至都不知道股利是什么,他们仅仅把股票想象为一种会升值的玩意

耶鲁公开课 - 金融市场课程节选