civil air defense basements
Civil air defense engineering
Civil Air Defense projects
Civil Air Defense Works
high-rise building civil air defense basement
active phase control array radar
Active phased array radar
phased array radar
相控阵雷达
相控阵测量雷达
相控天线阵雷达
相控阵天线
相控阵
Air Leakage Rate of Air Preheater
air to air heat recovery unit
air to air missile launching envelope
arctic air [= arctic air mass]