This is not a romantic notion but verifiable fact.

这不是一个不切实际的念头，而是一个有依据的事实。

《柯林斯英汉双解大词典》

This is a known scientific fact and is verifiable.

这是一个已知的科学事实和核实。

youdao

Perfomatives: are the sentences that did not state a fact or describe a state, and are not verifiable. But they are used by the speaker to do STH.

既不是陈述事实也不是描写状态，无法证实，但被说话者用来做事的。

youdao

It is ironic that this statement was juxtaposed with a pronouncement that Saddam Hussein would not be allowed to have biological and other WMD capabilities. (4) After all, the fact that such a threat has to be made at all is evidence of the utter futility of seeking verifiable arms control limitations on biological weaponry.

CENTERFORSECURITYPOLICY: Pull The Plug On Mir