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спертый воздух stresses
gen.	dead air; state air; frowst; a close atmosphere; stuffy air
construct.	stagnant air
inf.	fug
Makarov.	close air; vitiated air
tech.	foul air
спёртый воздух
Gruzovik	stuffy air
Makarov.	stale air
transp.	dead air

спёртый воздух: 9 phrases in 2 subjects

General	6
Makarov	3