First, he had to establish his credentials as a researcher.
首先，他得
明自己做调查员的资
。
书; 国书
明人的能力、资等的)书; 资，条件;明是真实的、可靠的或有效的;书;明书, 执照;
派,信赖,鉴定合;明,鉴定;明;
查
员会；件
员会First, he had to establish his credentials as a researcher.
首先，他得明自己做调查员的资。
The ambassador presented her credentials to the monarch.
外交官将她的明书呈交国王。
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，其表达内容亦不代表本软件的观点；若发现问题，欢迎向我们指正。
