I don't know how to turn it on, I don't know what to do.

我不知道怎样打开，不知道要做什么。

麻省理工公开课 - 媒体、教育、市场课程节选

I don't actually know exactly what it would take, but you just cut off and snip the relevant nerve endings so that we're no longer able to engage in that higher order thinking.

我不知道手术到底怎样做，但只要切除相关的神经末梢,让我们无法进行,更高层次的思维。

耶鲁公开课 - 死亡课程节选