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 understood why the old man asked me to buy his wife's sweet potato.

我明白了为什么老人要我买他妻子的红薯。

youdao

It wasn't the last time I witnessed someone thanking Mom or praising her on her bedside manner, but it was the first time I understood why I stood at the bus stop every morning.

这不是我最后一次看到有人感谢妈妈或赞扬她对病人的态度，但这是我第一次明白为什么我每天早上都要站在公交车站。

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

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

FORBES: Fact and Comment

Now I understood why so many people were hired initially: they were prepared for the no-shows.

FORBES: Longread: Confessions of a Senior PGA Championship Mobile Cart Operator