re·place·ment /rɪˈplesmənt/
 替換,代替;代替的人
 replacement
 替換 取代
 Re·place·ment n.
 1. The act of replacing.
 2. Crystallog. The removal of an edge or an angle by one or more planes.
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 replacement
      n 1: an event in which one thing is substituted for another; "the
           replacement of lost blood by a transfusion of donor
           blood" [syn: substitution, permutation, transposition,
            switch]
      2: the act of furnishing an equivalent person or thing in the
         place of another; "replacing the star will not be easy"
         [syn: replacing]
      3: someone who takes the place of another person [syn: surrogate,
          alternate]
      4: a person or thing that takes or can take the place of
         another [syn: substitute]
      5: filling again by supplying what has been used up [syn: refilling,
          replenishment, renewal]
      6: a person who follows next in order; "he was President
         Lincoln's successor" [syn: successor]