短語詞組短語cave -in prediction 冒頂預(yù)報(bào)stope cave -in 採場(chǎng)冒落tectonic cave -in 搆造塌陷lamb cave -in lamb凹陷treatment of cave -in 坍塌処理mining cave -in areas 鑛山塌陷區(qū) 返回 cave-in