I just wonder why our parents keep doing things like this.

我真的很想知道我们的家长为什么会这样。

youdao

I'm so sorry about that. But I just wonder why all of you never utter a single word of it.

真的很抱歉。不过，我很奇怪为什么大家都对此讳莫如深？

youdao

"I wonder why." Mr. Dambar shrugged. "It must be just one of those things, I guess."

“我想知道原因。”丹巴先生耸了耸肩说道。“我想这肯定是无法解释的事情。”

《柯林斯英汉双解大词典》

Just as I did when my son Keith was taken seven years ago, they now will wonder why the world continues to revolve - why it hasn't stopped in its tracks, how people can possibly go about their business as normal.

BBC: Chick Young's view