短语词组短语first impoundment 首次蓄水water impoundment 蓄水impoundment effect 蓄水效应reservoir impoundment 水库蓄水surface impoundment 地面储存natural impoundment 天然蓄水tailings impoundment 尾矿堆存impoundment basin 集水池;应急池impoundment lake 集水池 返回 impoundment