证明

In a sentence

• 他的研究结果证明了这个理论的正确性。

  His research results prove the correctness of this theory.

  Here, "证明" is used as a verb meaning "to prove" or "to demonstrate." It indicates that the subject has provided evidence or reasoning to support a statement, fact, or theory.

• 她带来了身份证作为身份的证明。

  She brought her ID card as proof of her identity.

  In this sentence, "证明" functions as a noun meaning "proof" or "evidence." It refers to documentation or confirmation used to validate something.

• 我需要去公证处开具一份收入证明。

  I need to get an income verification from the notary office.

  Here, "证明" acts as a noun, "verification" or "certificate." It describes an official document affirming the validity of a claim or statement.