The meeting could drag on for hours, and there's no telling when it will end.

会议可能会拖延数小时，谁也说不准何时才能结束。

金山词霸

" Is it true? "" Maybe, I'm not sure. ”

“ 那是真的 吗 ? ” “也许吧, 我说不准. ”

《简明英汉词典》

Some people are terribly insincere you can never tell if they are telling the truth.

有些人非常虚伪，你根本说不准他们是否在讲实话。

金山词霸

I could not gather from his appearance whether he was satisfied or not.

从他的表情看,我说不准他是否满意.

《简明英汉词典》

You never knew when you might stumble across some new talent.

谁也说不准什么时候会碰上一位新的天才.

辞典例句

I'm not certain whether the appointment has been put off or not.

我说不准那个约会是否延期了.

辞典例句

It may rain or it may not. It's hard to tell.

天也许下雨,也许不下. 说不准.

辞典例句

I don't rightly know whether it was Tuesday or Wednesday.

我说不准那天是星期二还是星期三.

辞典例句

Even now I don't know if she was a cherry then.

我直到今天也说不准她当初到底是个黄花闺女不是.

辞典例句

Their acceptance of the contract is still in doubt.

他们是否接受那合同还说不准.

辞典例句

I have no understanding of it and I am not sure that I believe in it.

我根本不懂这个,也说不准我是不是相信.

英汉文学 - 老人与海

I'm not clear about the precise bearing of the word in this passage.

我 说 不准这个字在这段文章里的确切意义是什么.

辞典例句

Nobody can tell what the future world will look like.

将来的世界是什么样子,谁也说不准.

互联网

I can't rightly say what day it is.

我说不准那天是什么日子.

互联网

It is impossible to say with any accuracy how many are affected.

无论如何也说不准受影响的有多少.

互联网