First, he had to establish his credentials as a researcher.
，他得证明自己做调查员的资
。
证书; 国书等的)证书; 资，条件;证书;;审查委员会；证件审核委员会First, he had to establish his credentials as a researcher.
，他得证明自己做调查员的资。
The ambassador presented her credentials to the monarch.
外交官将她的证明书呈交国王。
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