空投
airdrop; drop
空投燃烧弹
aerial incendiary bomb
空投深水炸弹
an aerial depth charge
空投炸弹
aerial bomb; aeroplane bomb
军用毒气
war gas
矿内毒气
damp
蓝十字毒气
blue cross
空气弹簧
air spring; air suspension; pneumatic cushioning
净化空气总管
clean air manifold
净空
headroom
clear space
净空高度
head room; head-room clearance; overhead clearance
净空间
clear space
静止空气粘滞性
viscosity of stationary air
绝对空间
absolute space
绝对真空
absolute vacuum
军事航空管制
military air-traffic control
卡尔真空烘箱
carr oven
开放领空
open skies
开空头支票
kite flying
开空头支票的人
paper hanger