co·ad·ju·tor /ˌkoəˈʤutɚ/
  助手,副員,副主教
  Co·ad·ju·tor n.
  1. One who aids another; an assistant; a coworker.
     Craftily outwitting her perjured coadjutor.   --Sheridan.
  2. R. C. Ch. The assistant of a bishop or of a priest holding a benefice.
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  coadjutor
       n : an assistant to a Bishop