短語詞組短語cave -in prediction 冒頂預(yù)報(bào)stope cave -in 采場冒落tectonic cave -in 構(gòu)造塌陷lamb cave -in lamb凹陷treatment of cave -in 坍塌處理mining cave -in areas 礦山塌陷區(qū) 返回 cave-in