他们不知何去何从。

They did not know whither they should go.

《牛津词典》

不知您能否来参加聚会。

I was wondering whether you'd like to come to a party.

《牛津词典》

不知何故，他试图数星星。

He was trying, for some unknown reason , to count the stars.

《牛津词典》

I know not what the younger dreams-- Some vague Utopia--and she seems, When withered old and skeleton-gaunt, An image of such politics.

我不知年幼者梦想什么-,某种模糊的乌托邦--她仿佛，当枯萎衰老瘦骨嶙峋的时候，这类政治的一个鬼影。

耶鲁公开课 - 现代诗歌课程节选

So that you're not just handed something that's entirely new to you with no idea which direction to go, we actually do set you off on an appropriate path.

这样一来就不会因为面对完全陌生的东西,而不知何去何从了，我们真心希望能把你们带到正确的道路上来。

哈佛公开课 - 计算机科学课程节选

When somebody invented the automobile, before you knew it everyone was driving automobiles and they all looked pretty much the same.

有人发明了汽车,不知不觉,每个人都开上汽车了,而且那些汽车外形看起来都差不多

耶鲁公开课 - 金融市场课程节选