First, he had to establish his credentials as a researcher.
首先，他得证明自己做调
的
。
证书; 国书
、等的)证书; ，条件;证书;
派,信赖,鉴定合;, 技;审
会；证件审核会First, he had to establish his credentials as a researcher.
首先，他得证明自己做调的。
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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