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

书; 国书


能力、资
等
)
书; 资
,条件;
是真实
、可靠
或有效
;
书;
书, 执照;
;
,鉴定;
;
审查委员
;
件审核委员
First, he had to establish his credentials as a researcher.
首先,他得
自己做调查员
资
。
The ambassador presented her credentials to the monarch.
外交官将她

书呈交国王。
声
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