hy·dro·ge·na·tion /haɪˌdrɑʤəˈneʃən, ˌhaɪdrəʤə-/ 名詞
  氫化,加氫,氫化作用
  Hy·dro·gen·a·tion n. Chem. The act of combining with hydrogen, or the state of being so combined.
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  hydrogenation
       n : a chemical process that adds hydrogen atoms to an
           unsaturated oil; "food producers use hydrogenation to
           keep fat from becoming rancid"