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естественное препятствие stresses
auto.	physical obstacle
law	natural obstacle
mil.	topographic barrier; existing obstacle (Киселев); topographic obstacle; terrain obstacle
mil., tech.	forbidding terrain; natural obstruction; terrain obstruction; topographical obstacle
sec.sys.	natural barrier (напр. провал на дороге)

естественное препятствие: 17 phrases in 3 subjects

General	1
Military	15
Sports	1