There's no telling how they'll react.

说不准他们会有什么反应。

《牛津词典》

There's no telling what will happen next.

下一步还不定会发生什么事。

《牛津词典》

How she's done it there's no telling.

她是怎么做到的，谁也不知道。

youdao

But if it gets in here, there ain't no telling because nobody went through this before."

VOA: standard.2010.05.06

I'm always telling my kids,"Don't like"-- no.It is indeed very regular--So it is indeed very regular so that's one thing, and by regular we mean these patterns keep repeating again and again.

我总是对我的孩子说，不要说貌似-,它非常规则，所以它非常规则，这是其一，然后我们希望这些形式不断重复。

耶鲁公开课 - 聆听音乐课程节选

Telling white pioneers that they could no longer shoot game in the boundaries of Yosemite National Park to feed their families or cut down trees for firewood was much harder.

VOA: standard.2009.11.25

No telling how much gas they'll find, because no one ever bothered to look for it.

FORBES: Magazine Article

Officials hope to pass reforms this year, but there's no telling whether they will succeed.

WSJ: Business Asia: Investing: It's More Frustrating in the Philippines

This is of course still in negotiation, so no telling what we'll actually end up with.

ENGADGET: Sprint Nextel in talks over cable company partnerships