I could never understand why she was fired.

　　我怎么也不明白她為何被解雇。

　　I still don't understand why you chose that name in the first place.

　　我仍不明白，你究竟為什么取了這么個(gè)名字。

　　I can't understand why they don't want us.

　　我不明白為什么他們不要我們。

　　I can't for the life of me understand why you didn't think of it.

　　我無論如何也無法理解你為什么沒想到這個(gè)。

　　One will never be able to understand why these political issues can acquire such force

　　人們永遠(yuǎn)也不會(huì)明白為什么這些政治問題會(huì)有如此大的影響力。