First, he had to establish his credentials as a researcher.
首先，他得证明自己做调查员的
。
证
; 国等的)证; ，条件;证;, 执照;;审查委员会；证件审核委员会First, he had to establish his credentials as a researcher.
首先，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
呈交国王。
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