I can't say for certain when we'll arrive.

我说不准我们什么时候能到。

《牛津词典》

I can't say for certain who will come.

我没有把握谁会来。

youdao

I can't say for certain, but let's set up a phone interview for Monday.

我还不能完全确定，不过我们可以在周一进行一次电话面试。

youdao

"The one thing which one can say about this election -- and we haven't been able to say this for any election within living memory -- is that the only certain thing is that we cannot predict the outcome, even on the day before the poll."

VOA: standard.2010.05.05

The literary creator starts to seem a lot more like the divine creator, that is to say, and in a certain sense could be understood as a placeholder for the divine creator.

这些作者越来越被神化了，换句话说，在一定意义上,就被理解为神圣造物主的预留的位置。

耶鲁公开课 - 文学理论导论课程节选

A section of DNA that is responsible for encoding a gene, let's say it's the insulin gene for example, might be some stretch of DNA on a certain chromosome inside your cells, inside the cells of the pancreas.

一段编码蛋白的DNA序列,我们就拿编码胰岛素的基因来举个例子,它也许是一段DNA基因序列,位于你胰腺细胞里的,某条染色体上

耶鲁公开课 - 生物医学工程探索课程节选

As for the owl, nobody could say for certain after the fire whether it would return.

CNN: Spotted owl could be game-changer in Tombstone water war

No one can say for certain just how she survived the water and the wreckage around her.

WHITEHOUSE: Standing with Japan

But we can say for certain that 2004 will go down as the Year of the Internet.

FORBES: Net--One, TV--Zero