First, he had to establish his credentials as a researcher.
首先，他得证明自己做调查员的
格。
,
合格;;
格，
件;
;格,能力,作证能力;First, he had to establish his credentials as a researcher.
首先，他得证明自己做调查员的格。
The ambassador presented her credentials to the monarch.
外交官将她的证明书呈交国王。
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