First, he had to establish his credentials as a researcher.
首先，他得
明自己做调查员
资格。
国书,信任状
明;明书, 执照;明,鉴定;书;;
件;书，学位书;明是真实、可靠或有效;能力;First, he had to establish his credentials as a researcher.
首先，他得明自己做调查员资格。
The ambassador presented her credentials to the monarch.
外交官将
明书呈交国王。
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