First, he had to establish his credentials as a researcher.
首先，他得
自己做调查员
资格。
国书,信任状
;书, 执
;,鉴定;书;
;
件;书，学位书;是真
、靠或有效;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.
外交官将她书呈交国王。
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