Taivo A Taiwan Mandarin dictionary

回火

huíhuǒ

ㄏㄨㄟˊ ㄏㄨㄛˇ

  1. 1to temper (iron)
  2. 2to flare back
  3. 3flareback (in a gas burner)
  4. 4(of an engine) to backfire

Keep 回火 and it comes back until you know it.

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