我不懂为什么他们需要做体操。

I don't see why they need exercises.

youdao

我不懂为什么当时我会没想出一个借口回绝了他。

I do not know why at the moment I could think of no excuse.

youdao

我搞不懂为什么每个老师跟教练永远都把他们对我的要求摆在第一位。

Why is it every teacher and coach think their demands of me come first?

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

People can't deal with this poem until they can get a handle on the fact that it doesn't rhyme.

人们搞不懂这诗为什么不押韵,就无法理解它。

耶鲁公开课 - 弥尔顿课程节选