First, he had to establish his credentials as a researcher.
首先，他得
明自己做调查员的资格。
词
明;明书, 执照;明,鉴定;书;;
件;书，学位书;明是真实的、可靠的或有效的;
,作;First, he had to establish his credentials as a researcher.
首先，他得明自己做调查员的资格。
The ambassador presented her credentials to the monarch.
外交官将她的明书呈交国王。
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false
