一场关于到底发生了什么事的辩论开始了。

A debate arose over what exactly was happening.

youdao

当你下次看到他，问一问这家伙，到底发生了什么事情。

The next time you see him, ask this guy what happened.

youdao

警方正设法查清到底发生了什么。

The police are trying to ascertain what really happened.

《牛津词典》

So, let me go had and let's swivel this around for just a moment so we have a blank slate and now what's really going on?

我把它旋转一下,这样就有一块空白了,到底发生了什么呢？

哈佛公开课 - 计算机科学课程节选

There may be some inefficiencies, and at some point, if you catch me in the hallway, I can give you a sermon on what goes on inside that reactor.

可能会有某些损耗，如果你能在过道上遇到我的话，我会给你详细讲讲,里面到底发生了什么。

麻省理工公开课 - 固态化学导论课程节选

Let's see what happens here, just the motif, one, two, three, four, three four, one two, and then the theme.

让我们看看到底发生了什么,正是动机,一,二,三,四,一遍又一遍,然后是主题

耶鲁公开课 - 聆听音乐课程节选