First, he had to establish his credentials as a researcher.
首先，他得证明自己做调查员
资格。
国
,信任状, 
;;
证;
件;，学位证;、
或有效;First, he had to establish his credentials as a researcher.
首先，他得证明自己做调查员资格。
The ambassador presented her credentials to the monarch.
外交官将她证明
呈交国王。
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