First, he had to establish his credentials as a researcher.
首先，他得证明自己做调查员的
。
交
所递的国书,信任状
;证书;
，
件;,能力,作证能力;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.
交官将她的证明书呈交国王。
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