evidence是不可数名词。
evidence：n.根据；证明；证据；(法庭上的)证据；
v.证明；表明；作为…的证据
The police were much in evidence at today's demonstration.
在今天的示威集会上警察随处可见。
There wasn't enough evidence to bring the case to court.
没有足够的证据可把此案提交法庭。
We have no positive evidence that she was involved.
我们没有确凿证据证明她参与其事。
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