Sorry, I don't follow you.

对不起，我听不懂你的话。

《牛津词典》

I'm sorry, I don't follow.

对不起，我不理解。

《柯林斯英汉双解大词典》

Sorry, I don't follow.

对不起，我不明白。

《牛津词典》

I don't follow too closely.

我没有密切关注。

经济危机的影响 - SpeakingMax英语口语达人

So, if you by chance, I know it's very rare, but if by chance you don't get the class you can always follow up later.

如果你们偶然，我知道不太可能，但是如果不小心你们错过了某节课,你们就可以在之后补回来了。

麻省理工公开课 - 固态化学导论课程节选

or if I'm, I don't know, or if I want to sort of follow in their footsteps and,

或者，我也不清楚，如果我想跟随他们的脚步，

要想成为事业家 - SpeakingMax英语口语达人

Maybe that's why I don't follow the actual competition in progress so much.

CNN: The agony and ecstasy of the National Spelling Bee

Esther Dyson: I don't actually follow public stocks, but I think there are huge opportunities in companies that offer services for individuals (sometimes via doctors or institutions, and sometimes directly).

FORBES: Intelligent Investing

But I don't know if he'll follow through once he gets in there.

NPR: Candidates Mine For Rural Votes In Nevada