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防空区
avia. air defence area; antiaircraft sector; air defence zone
el. air defence region
space air-defence zone; air defense zone; air defense area
防空区
gen. air defense area
防空区
gen. anti-aircraft sector
防空有效
astronaut. air defense coverage
防空 区: 106 phrases in 8 subjects
Air defense12
Aviation39
Electronics8
General5
Nautical3
Space33
Technology1
United States5