Why do not you know that you are happy every day?

知道你每天为什么不快乐吗？

youdao

In flames: I don't really know how to do this safely, but if you can figure it out, why not write them a message in flames?

火焰：我还不知道怎样才能安全的做到，不过如果你能想到办法，为什么不用火焰给她写一句话呢？

youdao

Kidnap them: If you know your partner has nothing to do on a certain day, why not kidnap them and surprise them with a special getaway?

“绑架”：如果你知道你的爱人某一天没有事，为什么不“绑架”她一下，用特殊的出游给她一个惊喜呢？

youdao

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

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

If you really love something and you want to do it the right way, why not do it until you really know you can't do it anymore.

CNN: Federer leads charge of the old men

And, as always American thinks: Why do we do this when you know I am not a terrorist, and you know I know you know I am not a terrorist?

NPR: 'This American Moment' As Peggy Noonan Sees It

But do you know who these people are and why they do not pay income taxes?

FORBES: The Real Truth Behind The 47 Percent - Why Aren't These People Paying Federal Income Taxes?