First, he had to establish his credentials as a researcher.
首先，他得证明自己做调查
的资
。
证
; 
何证明人的能力、资等的)证; 资，条件;证;, 执照;
派,信赖,鉴定合;审查
；证件审核First, he had to establish his credentials as a researcher.
首先，他得证明自己做调查的资。
The ambassador presented her credentials to the monarch.
外交官将她的证明
呈交
王。
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