First, he had to establish his credentials as a researcher.
首先，他得证
自己做调查员的资格。
,信任状
;, 执照;,鉴定;;
件;，学位证;是真实的、可靠的或有效的;First, he had to establish his credentials as a researcher.
首先，他得证自己做调查员的资格。
The ambassador presented her credentials to the monarch.
外交官将她的证
交国王。
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