In court you would say there was some circumstantial evidence for it, but no proof.

在法庭上你只能说有它存在的一些旁证，但没有足以一锤定音的证据。

youdao

Scientists say the compound is likely to cause cancer but have no hard scientific proof.

科学家们称这种化合物可能致癌，但是并没有确凿的科学依据。

youdao

But she had no proof of this, and her instinct in the circumstances was to avoid its purlieus.

但是她没有这方面的证明，因此在这种情形下，她的本能就是避免接触这个社会。

youdao

This has been checked for the first 100 billion zeros, but no proof appears to be in sight.

ECONOMIST: Mathematics

But no proof of death has been made public for Mr Allex.

BBC: Somalia's al-Shabab 'to kill' French hostage Denis Allex

It also recommended a "precautionary approach" for mobile phone users, particularly children, saying there was no evidence that this caused health problems, but no proof that it did not.

BBC: Report dismisses phone mast fears