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наблюдатель за воздухом stresses
gen.	aircraft spotter; air scout
Gruzovik, mil., air.def.	air-defense look-out
mil.	air sentinel; aerial scout; air guard; air observer; overhead guard (при движении на машинах); tactical air observer; air sentry
mil., arm.veh.	air guard observer
mil., artil.	aerial observer; aircraft observer; antiaircraft lookout
mil., artil., slang	bob-down man
mil., inf.	bird watcher

наблюдатель за воздухом: 3 phrases in 2 subjects

General	1
Military	2