certification [ˌsɜ:rtɪfɪˈkeɪʃn]

例句:

• An employer can demand written certification that the relative is really ill.
  雇主可以要求出具书面证明，证实员工的亲人确实病了。
  
• 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.
  
• Last year, the country celebrated its certification as rinderpest-free.
  来自VOA
• US trained physicians must have achieved board eligibility or certification.
  来自SA
• The city had rightly appealed that class-certification order.
  来自WSJ