短語詞組短語rock -fall impaction 落石沖擊rock fall deposit 巖塌沈積loose rock fall 松石坍落rock fall geological hazard 巖質(zhì)邊坡rock fall fence 防石欄;防石圍墻;防墜石圍欄cap rock fall 蓋巖瀑布 返回 rock fall