“彼得，”她问，试图坚定地说，“你对我到底是什么感觉？”

"Peter," she asked, trying to speak firmly, "what are your exact feelings to [about] me?"

youdao

在你心里我到底是什么位置？

What location am I in the heart after all in you?

youdao

这张有用的地图应该有助于你了解我到底是什么意思。

This useful map should give you a better idea of what I'm getting at.

youdao

Now, how could it be that a photograph reminds me of my friend?

那到底是什么,让我通过照片联想到我的朋友呢?

耶鲁公开课 - 死亡课程节选

What am I doing on this earth with regard to this particular course?

我开这门课,到底是为了什么

耶鲁公开课 - 聆听音乐课程节选

I don't know. All right, so what happens?

我不清楚到底是什么原因，怎么了？

麻省理工公开课 - 固态化学导论课程节选