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запасная позиция stresses
gen.	fall-back position (pfedorov)
astronaut.	alternate position
automat.	buffer position
fish.farm.	fallback position
Gruzovik, mil.	third line
mil.	alternative position; alternate fighting position (Киселев); emergency position; alternate location; alternate emplacement
mil., tech.	alternate emplacement (средства вооружения)
запасная огневая позиция
weap.	emergency position (ABelonogov); supplementary position (ABelonogov)

запасная позиция: 13 phrases in 4 subjects

Armored vehicles	1
Artillery	6
Astronautics	2
Military	4