It has to be proved that they are the guilty party.

尚需证明他们是有过错的一方。

《柯林斯英汉双解大词典》

The rumours that she had poisoned him could never be proved.

说她毒死了他的谣言永远不可能得到证实。

《柯林斯英汉双解大词典》

If he did not do it, then the adventure would be proved to have been only a dream.

如果他不这样做，那么，那次冒险将被证明只是一场梦。

youdao

Hero's family decides to make Claudio believe that she is dead until her innocence can be proved.

VOA: special.2010.01.06

If it does not hold water, then it is weak and cannot be proved.

VOA: special.2009.05.10

Mrs.Shriver said that the Special Olympics proved a very important fact: that exceptional children with mental retardation can be exceptional athletes.

VOA: special.2009.08.23

But the fraud could not be proved because of an absence of easily-accessible data.

BBC: Pakistan hopes for 'cleanest' elections in history

At the time it could not be proved that he was personally responsible for any killings.

BBC: Former Auschwitz Nazi guard Hans Lipschis found in Germany

No one was willing to abandon a treaty when cheating could not be proved beyond a doubt.

CENTERFORSECURITYPOLICY: Center for Security Policy | A New Skepticism on Arms Control, By James T. HackettThe Washington Times, 18 October 1999