“到底是什么在烦你？”他问道。

"What the hell's eating you?" he demanded.

《柯林斯英汉双解大词典》

你到底知不知道自己在干什么？

What the hell do you think you are doing?

《牛津词典》

那个士兵在那儿到底在干什么不得而知。

Just what the soldier was doing there is unclear.

《柯林斯英汉双解大词典》

Thermodynamics is asking you, what work does this thing do on the surroundings or the surroundings do on the system?

热力学在问你们，到底是系统对环境做功,还是环境对系统做功？

麻省理工公开课 - 热力学与动力学课程节选

We are honoring instead the integrity of what they're saying without thinking about whether or not it might be true.

我们事实上反而在,尊重他们所说内容的真实性,却从未想过这到底是不是真的。

耶鲁公开课 - 文学理论导论课程节选

So, this is my question to you: how complete and perfect is the image of Providence that hovers moonlike over the pages of Paradise Lost?

因此，我的问题是：，这里如月亮一般,在的字里行间反复出现的天意的形象,到底是有多么的完整和美好？

耶鲁公开课 - 弥尔顿课程节选