certification [ˌsɜ:təfɪˈkeɪʃən]

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附加级

n.证明，鉴定，证书

the medical certification of the cause of death 为死因出具医学鉴定
He received his certification as a high school English teacher. 他取得了中学英语教师证书。来自《简明英汉词典》