cor·ro·sion /kəˈroʒən/
  腐蝕;腐蝕狀態;減退
  cor·ro·sion /kəˈroʒən/ 名詞
  腐蝕,侵蝕,鏽,鐵鏽
  Cor·ro·sion n.  The action or effect of corrosive agents, or the process of corrosive change; as, the rusting of iron is a variety of corrosion.
     Corrosion is a particular species of dissolution of bodies, either by an acid or a saline menstruum.   --John Quincy.
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  corrosion
       n 1: a state of deterioration in metals caused by oxidation or
            chemical action
       2: erosion by chemical action [syn: corroding, erosion]