First, he had to establish his credentials as a researcher.
首先，他得证明自己做调查
资
。
证书; 国书
、资等)证书; 资，条件;、可靠或有效;证书;
派,信赖,鉴定合;, 技;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资。
The ambassador presented her credentials to the monarch.
外交官将她证明书呈交国王。
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false
