back·draught
noun/ˈbækdrɑːft/
/ˈbækdræft/
(also backdraft)
- a current of air that flows backwards down a chimney, pipe, etc.
（烟囱、管道等的）倒烟，倒灌风 - an explosion caused by more oxygen being supplied to a fire, for example by a door being opened
（给火焰供氧过多引起的）回火爆炸