de·vit·ri·fy /(ˌ)diˈvɪtrəˌfaɪ/
  (vt.)除去玻璃光澤,使不透明
  De·vit·ri·fy v. t. To deprive of glasslike character; to take away vitreous luster and transparency from.
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  devitrify
       v 1: become crystalline
       2: make (glassy materials) brittle or opaque
       [also: devitrified]