N-PLURAL 资格;资历 Someone's credentials are their previous achievements, training, and general background, which indicate that they are qualified to do something.
...her credentials as a Bach specialist... 她作为巴赫研究专家的资历
I can testify to the credentials of the clientele. 我可以证明委托人的资质。
N-PLURAL 资格证书;证明书;证件 Someone's credentials are a letter or certificate that proves their identity or qualifications.
Britain's new ambassador to Lebanon has presented his credentials to the President. 英国驻黎巴嫩的新任大使已将国书递交给总统。