我不知道我真的不知道我…

I don't know. I really don't know.

youdao

“可是我不知道，”他说，“谁也不知道！”

"But I do not know it," said he, "and no one knows it!"

youdao

直到今天，我仍然不知道是什么跟着我回家，但我很害怕，我宁愿不知道。

To this day, I still have no idea what followed me home but I was terrified and I'd rather not find out.

youdao

I don't know where any one of them is, but I can tell you on average where any one of them is likely to be.

我不知道它们中单独的个体在哪，但我可以大体告诉你,它们其中一个将是会怎样。

麻省理工公开课 - 固态化学导论课程节选

It's called, I don't know if you guys speak any Japanese, but it's called Bungo, the thing that we're focusing on.

我不知道你们是否会日语，但我们主要学习的东西被称作“豊后”。

最喜欢的一门课 - SpeakingMax英语口语达人

I don't know if you heard this morning, but there was news of the discovery of yet one more element.

我不知道你们今早听说了没，有一个新发现,一个新的元素的发现。

麻省理工公开课 - 固态化学导论课程节选