First, he had to establish his credentials as a researcher.
首先，他得
自己做调查员的资
。
书; 国书
人的能力、资等的)书; 资，条件;
;是真实的、靠的或有效的;书;书, 执照;赖,鉴定合;,鉴定;;审查委员会；件审核委员会First, he had to establish his credentials as a researcher.
首先，他得自己做调查员的资。
The ambassador presented her credentials to the monarch.
外交官将她的书呈交国王。
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