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