NUMERICAL ANALYSIS ON MOVEMENT AND FAILURE OF COAL AND STRESS CONDITION OF SUPPORT STRUCTURES IN MECHANIZED TOP-COAL CAVING IN STEEP THICK SEAM是什么意思_NUMERICAL ANALYSIS ON MOVEMENT AND FAILURE OF COAL AND STRESS CONDITION OF SUPPORT STRUCTURES IN MECHANIZED TOP-COAL CAVING IN STEEP THICK SEAM在线翻译_英语_读音_用法_例句