We could never know.

我们永远不会知道。

youdao

You never know, we could go all the way.

BBC: P Collingwood

"Software could shape the outcome of a surprise election--and we'll never know, " says Dill.

FORBES: Magazine Article

They were nothing to do with us whatsoever but Customs seemed to believe they could bill my innocent company for the crimes of people we had never met or even had the means to know about.

BBC: NEWS | Programmes | Panorama | Do you want to be a millionaire: The victim's story