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спокойный атмосфера stresses
astronaut.	still air
спокойная атмосфера
gen.	calm atmosphere
aerohydr.	nonturbulent air; static atmospheric conditions
astronaut.	free air
avia.	calm air; smooth air; still air
Makarov.	quiet atmosphere
tech.	free atmosphere; free undisturbed atmosphere

спокойный атмосфера: 4 phrases in 2 subjects

Aerohydrodynamics	2
Aviation	2