虽然我不知道他是谁，但我知道他是为了谁。

Although I don't know who he is, I know who he is for.

youdao

虽然我很长时间都不知道他了，他乐意地答应了。

Although I hadn't known him long, he readily agreed.

youdao

可是我不知道自己的名字，虽然我知道大家都有名字。

I did not know, yet knew that all had names.

youdao

But I was convinced I'd hear the click-click-click-click-click which is what tells you you're in trouble.

我总会觉得很紧张，我不知道这是为什么,虽然我从来没有接触过放射元素。

麻省理工公开课 - 化学原理课程节选

So I don't know how that's going to work out, but

虽然我不知道怎样来实行这个计划，但是

想要个农场 - SpeakingMax英语口语达人

Let's assume that I know what I'm earning next year; there is actually uncertainty about it.

假设我知道我明年会赚多少钱,虽然这通常都是不确定的

耶鲁公开课 - 金融市场课程节选