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удушливый газ stresses
gen.	chokedamp (в рудниках); choking gas; choke damp (в рудниках)
Gruzovik	asphyxiating gas
chem.	asphyxiant gas
geol.	poison gas
mining.	blackdamp
oil	choke damp; suffocating gas
therm.eng.	gas
удушливые газы
O&G, sakh.	asphyxiant gases

удушливый газ: 3 phrases in 2 subjects

Geology	2
Mass media	1