I could never understand why she was fired.
我怎么也不明白她为何被解雇。
I still don't understand why you chose that name in the first place.
我仍不明白，你究竟为什么取了这么个名字。
I can't understand why they don't want us.
我不明白为什么他们不要我们。
I can't for the life of me understand why you didn't think of it.
我无论如何也无法理解你为什么没想到这个。
One will never be able to understand why these political issues can acquire such force
人们永远也不会明白为什么这些政治问题会有如此大的影响力。