tri·ox·ide /(ˌ)traɪˈɑkˌsaɪd/
  三氧化物
  tri·ox·ide /(ˈ)traɪˈɑkˌsaɪd/ 名詞
  三氧化物
  Tri·ox·ide n.  Chem. An oxide containing three atoms of oxygen; as, sulphur trioxide, SO3; -- formerly called tritoxide.
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  trioxide
       n : an oxide containing three atoms of oxygen in the molecule