First, he had to establish his credentials as a researcher.
首先，他得证明自己做调查员
。
证书; 国书
能力、
)证书; ，条件;、可靠或有效;证书;;
查委员会；证件核委员会First, he had to establish his credentials as a researcher.
首先，他得证明自己做调查员。
The ambassador presented her credentials to the monarch.
外交官将她证明书呈交国王。
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核，其表达内容亦不代表本软件观点；若发现问题，欢迎向我们指正。
