回火
huí huǒ
基本释义
  1. 把淬硬的钢或铸铁在比前次淬火温度低得多的温度中加热使软化
英文翻译
  1. to temper (iron)
  2. (of an engine) to backfire
  3. flareback (in a gas burner)
  4. to flare back