акустичний (звуковий) фон
overhead
overhead concealment
overhead cover(ing) / protection
overhead fire
overhead intelligence
overhead liquid dispersal system (OLDS, NATO)
clearance of overhead crossovers of a bridge
overhead remote controlled weapon station (ORCWS)
cylinder overhead valve
overhead luggage bay
overhead light
acoustic beam
acoustic bullets
acoustic countermeasures
acoustic field
acoustic homing torpedo
acoustic impact
acoustic intelligence
acoustic mine
acoustic mine-hunting
acoustic sensor
acoustic target-sensor
acoustic warfare
acoustic warfare countercountermeasures
acoustic weapons
acoustic detecting apparatus
acoustic profile
underwater acoustic surveillance
acoustic beacon
acoustic lining
acoustic airport environment
acoustic alteration