First, he had to establish his credentials as a researcher.
首先,他得
明自己做调查
资
。

书; 国书
明

力、资
等
)
书; 资
,条件;
明是真实
、可靠
或有效
;
书;
明书, 执照;
;
明,鉴定;
明;
力, 技
;
审查委
;
件审核委

First, he had to establish his credentials as a researcher.
首先,他得
明自己做调查
资
。
The ambassador presented her credentials to the monarch.
外交官将她
明书呈交国王。
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