短语词组短语high -bank caving 大放高bank caving line 坍岸线bank caving and protection 崩岸与护岸mechanism of bank caving 坍岸机制present state of bank caving 坍岸现状Stability of the bank caving 塌岸体稳定性caving bank 淘空堤岸;坍岸 返回 bank caving