Mister Weindruch says researchers do not know why reducing calories increases the length of life.

VOA: special.2009.09.01

But, you know why not do something a little special, little different, and they decided instead to use lithium.

但是你懂的，为什么不做的更特殊，更与众不同一些呢？

麻省理工公开课 - 化学原理课程节选

Usually when you know why it's not working, it's obvious what you have to do to make it work.

通常你明白了出错的原因后，很明显你必须让程序正常运行起来。

麻省理工公开课 - 计算机科学及编程导论课程节选

They do not know why all these things were found together in one place.

VOA: special.2010.08.03

So, hedge funds do not advertise, that's why people don't know about them and they have a mysterious -they sound mysterious.

对冲基金公司做不了广告,那也是公众并不了解他们的原因,他们披着一层神秘的面纱...,他们听起来挺神秘的

耶鲁公开课 - 金融市场课程节选

Scientists do not know why women are more at risk than men.

VOA: special.2009.04.14

So, the radical idea here is you might not know what--why you do what you do and this is something we accept for things like visual perception.

由此引出的一个偏激的观点,你根本不知道自己为何要这么去做,这有点像我们获得视觉感知的过程。

耶鲁公开课 - 心理学导论课程节选

Researchers do not know why happiness increases as people get older.

VOA: special.2010.08.03

Scientists do not know why women are more at risk.

VOA: special.2010.06.15

I do not know why I should fear death.

VOA: special.2010.07.10

why,when we do not sleep, we do not function well. We just do not know much about sleep at all."

VOA: special.2009.08.26

Doctors do not yet know why this is true.

VOA: special.2010.06.15