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同学你好，
根据Oxford Dictionary, [uncountable] the facts, signs or objects that make you believe that something is true； the information that is used in court to try to prove something.
examples:
I was asked to give evidence (= to say what I knew, describe what I had seen, etc.) at the trial.
He was released when the judge ruled there was no evidence against him.
evidence (of something) There is convincing evidence of a link between exposure to sun and skin cancer.
The room bore evidence of a struggle.
evidence (for something) We found further scientific evidence for this theory.
evidence (that…) There is not a shred of evidence that the meeting actually took place.
evidence (to suggest, show, etc.) Have you any evidence to support this allegation?
On the evidence of their recent matches, it is unlikely the Spanish team will win the cup.
(specialist) The cave contained evidences of prehistoric settlement.
作为证据的时候是不可数名词。如果想要表示很多种证据可以用lines of evidence。有见到用可数的情况，不太建议使用。

祝学习愉快！