n.

1. 凭据，纪录，资格；证明，证明文件
   The candidates for the job will firstly be evaluated by their academic credentials.

   应聘这份工作的人首先会依他们的学术纪录来评估。

2. 国书（委任国元首发给地主国元首的公使介绍信或委任状）
   The new Ambassador to the UK presented his credentials to the Queen.

   新任驻英大使把他的国书呈交给女王。

n.

1. a qualification, achievement, etc., especially when used to indicate a person's suitability for something.
2. a letter of introduction given by a government to an ambassador before a new posting.