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