Even if they know what the company is up to, they still have no idea what they're paying for Facebook, because people don't really know what their personal data is worth.

即使他们知道公司在做什么，他们仍然不知道他们给 Facebook 付了多少钱，因为人们对自己的个人信息值多少钱没有确切概念。

youdao

What is the use of going to college if you don't know what you're going there for?

如果你不知道自己上大学的目的，上大学有什么用？

youdao

What we don't know is exactly what functionality will be delivered in each iteration.

我们所不知道的是，什么功能将准确地在每一个迭代过程中被交付。

youdao

"What we know from research on teen brain development, is that teens don't really have fully developed brains until they're twenty-five years old.

VOA: special.2010.07.01

if we can't think what system it belongs to, that's tantamount to saying we really don't know what it is.

我们就不知道它从属于哪个符号系统，我们就不能认识它了。

耶鲁公开课 - 文学理论导论课程节选

And you don't know basically if what you are being charged is necessarily the proper price.

你基本不知道你给多少车费是合适的。

小心微型出租车 - SpeakingMax英语口语达人

Mr. VARTHAM HAVAKIAN (Student, Lebanon): When you have the police censor your text, you don't know what is accepted and what is not, so that's our problem.

NPR: Play Challenges Lebanese to Face Past, Present

So I don't know what it is what he was derelict in doing.

NPR: Charges Expected Against Marines in Haditha Case

We don't quite understand it, we don't know what is going on, but it's working'.

BBC: Ross County fans