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обрушенная породаstresses
geol. caved ground
mining. broken-down rock; caved debris; gob rock
oil loose ground; loose robbing; loose rock
tech. caved material
обрушить породу
road.wrk. cave
обрушенная порода: 6 phrases in 4 subjects
Makarov1
Mining2
Oil / petroleum2
Rail transport1