fettling
  修補爐襯; 補爐; 鑄件清理
  Fet·tling n.
  1. Metal. A mixture of ore, cinders, etc., used to line the hearth of a puddling furnace. [Eng.]
  Note: [It is commonly called fix in the United States.]
  2. Pottery The operation of shaving or smoothing the surface of undried clay ware.
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