firebreak
/ˈfaɪrbreɪk/noun
1- an obstacle to the spread of fire防火障：
a fire-resistant door designed to be a firebreak
设计用作防火障的防火门
figurative 〈喻〉a firebreak against the spread of revolution from Russia.
防止革命从俄罗斯蔓延的屏障。
1.1
- a strip of open space in a forest or other area of dense vegetation防火带（指森林等植被稠密地区的空旷地带）。