短语词组短語mud -rock flow-prone area 泥石流易發區mud and rock flow 泥石流underground mud -rock flow 井下泥石流dump mud -rock flow 排土場泥石流glacial mud -rock flow 冰川泥石流volcanic mud -rock flow 火山泥石流treatment of mud -rock flow 泥石流処理 返回 mud rock flow