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безвоздушное пространство stresses
gen.	physics vacuum
astronaut.	empty space
avia.	void of space (космоса)
construct.	evacuated space
fig.of.sp.	space with no air (Alex_Odeychuk)
Makarov.	outer space
meteorol.	airless space
phys.	vacuum
tech.	air-free space; free space

безвоздушное пространство: 11 phrases in 4 subjects

Artillery	2
Astronautics	4
Makarov	2
Weapons and gunsmithing	3