pre·de·ces·sor /ˈprɛdəˌsɛsɚ/
  前任,先輩,以前的東西
  predecessor
  前導子
  Pred·e·ces·sor n.  One who precedes; one who has preceded another in any state, position, office, etc.; one whom another follows or comes after, in any office or position.
     A prince who was as watchful as his predecessor had been over the interests of the state.   --Prescott.
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  predecessor
       n : one who precedes you in time (as in holding a position or
           office)