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полоса обороны stresses
gen.	defensive position; defence area; combat area
foreig.aff.	defence zone
Gruzovik, mil.	defended area
Makarov.	line of defence
mil.	defense zone; defensive belt; defensive line; defensive zone; layer of defense; defensive sector; zone of defence; line of resistance; defense area; defense sector; defensive area; fortified belt
mil., avia.	ground defense area
mil., tech., fig.	fortress belt

полоса обороны: 53 phrases in 4 subjects

Artillery	6
Makarov	2
Military	44
Weapons and gunsmithing	1