我们不知道他是死是活。

We don't know whether he's alive or dead.

《牛津词典》

麻烦的是我们不知道他的地址。

The trouble is that we don't know his address.

youdao

我们不知道他还能撑多久，而我只能待一天。

We didn’t know how long he would last, and I could stay only a day.

youdao

Now I take it the dissertation can be read without knowing that, and the science is fine.

我认为我们在读他的论文是,在不知道他信仰时，他研究的科学并无不妥。

普林斯顿公开课 - 人性课程节选

We don't have anything written in Shakespeare's Own handwriting as we don't know what he wrote.

我们没有任何莎士比亚,手写的东西，不知道他写了什么。

麻省理工公开课 - 媒体、教育、市场课程节选

So it could be--From Hannibal's point of view he doesn't know which pass you're going to defend, but let's have a look at his payoffs.

站在汉尼拔的立场,他应该,不知道你会防守哪条路,但让我们看看他的收益

耶鲁公开课 - 博弈论课程节选