很抱歉，我不明白你说的是什么。

I am sorry, I can not understand what you said.

youdao

我一点也不明白你说的是什么意思。

I haven't the faintest idea what you mean.

youdao

停下来，我一点儿也不明白你说的什么。

Whoa! Back up, I did't understand anything you said.

youdao

Say, "Shelly, I didn't really understand what you were saying about the soul.

你就说，薛立，我真的不明白,你所说的关于灵魂。

耶鲁公开课 - 死亡课程节选

I mean, you've been banging on that pen for a long time and I don't understand why.

我是说，你一直用那支笔敲来敲去，我不明白为什么。

Would you please 实战 - SpeakingMax英语口语达人

I don't understand why he broke up with you, he said he loves you.

我真不明白他为什么要跟你分手，他之前还说他爱你。

I hate 实战 - SpeakingMax英语口语达人