大断面回采巷道
large section mining gateway
综放回采巷道
Mining Roadway in Fully Mechanized Caving Face
mining roadway for fully mechanized sublevel caving face
跨采巷道
roadway under overhead mining
综采巷道
Comprehensive mining roadway
长江口深水航道回淤
back silting of Yangtze Estuary Deepwater Channel