First, he had to establish his credentials as a researcher.
首先，他得证明自己做
资格。
,信任状, 执照;;
件;，学位证;、可靠或有效;First, he had to establish his credentials as a researcher.
首先，他得证明自己做资格。
The ambassador presented her credentials to the monarch.
外交官将她证明
呈交
王。
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