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