sub·stit·u·ent /səbˈstɪʧəwənt, ˈstɪʧwənt/
  取代
  sub·stit·u·ent /səbˈstɪʧ(ə)wənt/ 名詞
  取代物,取代基的,置換基的
  Sub·stit·u·ent n.  Chem. Any atom, group, or radical substituted for another, or entering a molecule in place of some other part which is removed.
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