First, he had to establish his credentials as a researcher.
先,他得证明自己做调查员的
。

证书; 国书
等的)证书; 


,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.
先,他得证明自己做调查员的
。
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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