I never understood why he didn't just accede to our demands at the outset.

我从不能理解为什么他不一开始就答应我们的请求。

《柯林斯英汉双解大词典》

I understood why her teacher asked her to stay in Grade Three.

我明白了为什么她的老师要她留在三年级。

youdao

I've never understood why they give you so much popcorn! It tasted pretty good, though.

我真不明白他们为什么给你这么多爆米花！不过味道还不错。

youdao

I never understood why Simon did this.

VOA: special.2009.07.18

It quickly became the city's staple snack, and, after one bite, I understood why.

WSJ: Indian Snacks That Pack a Punch

Loughner said he was heading home and understood why he was being pulled over.

CNN: SHARE THIS

It wasn't until I read Henry Kissinger's White House Years that I understood why.

FORBES: Fact and Comment