这件事无法证实。

It's impossible to prove.

《牛津词典》

答：我无法证实你提到的这一消息。

A: I cannot verify the information you just mentioned.

youdao

你提到的情况只是媒体报道，我无法证实。

The information you mentioned only comes from media reports and I can't confirm that.

youdao

Similarly, the so-called five books of Moses--Genesis, Exodus, Leviticus,Numbers, Deuteronomy, nowhere claim to have been written in their entirety by Moses.

同样地，所谓的摩西五经--《创世纪》,《出埃及记》《利未记》《民数记》《申命记》,无法被证实全部是摩西所写。

耶鲁公开课 - 旧约导论课程节选

It's not clear that this event ever really took place, but it's really not very important, because what Herodotus is doing is telling how he, I think, and how the Greeks in general viewed the questions at issue.

我们无法证实这件事是否真的发生过,但是这并不重要,因为我认为希罗多德是为了,告诉我们,他以及几乎所有的希腊人,是如何看待这个引人争议的问题的

耶鲁公开课 - 古希腊历史简介课程节选