他自己觉得很清醒，甚至充满活力，虽然他不知道为什么。

He himself was feeling quite wakeful and even lively, though he didn't know why.

youdao

虽然我们不知道这其中有多少是真实的，但可以肯定的是，丝绸栽培在中国已经存在了几千年。

While it is unknown just how much of this is true, it is certainly known that silk cultivation has existed in China for several millennia.

youdao

然而环境对她很有益处，虽然她自己一点也不知道。

Circumstances, however, were very kind to her, though she was not at all aware of it.

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

And they walk significantly slower toward the elevator, not knowing that they were primed with old words.

走向电梯的速度明显慢，虽然不知道自己被与“老“相关的字影射过。

哈佛公开课 - 幸福课课程节选