annealing
  韌化
  An·neal v. t. [imp. & p. p. Annealed p. pr. & vb. n. Annealing.]
  1. To subject to great heat, and then cool slowly, as glass, cast iron, steel, or other metal, for the purpose of rendering it less brittle; to temper; to toughen.
  2. To heat, as glass, tiles, or earthenware, in order to fix the colors laid on them.
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  An·neal·ing, n.
  1. The process used to render glass, iron, etc., less brittle, performed by allowing them to cool very gradually from a high heat.
  2. The burning of metallic colors into glass, earthenware, etc.
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  annealing
       n : hardening something by heat treatment [syn: tempering]