短語詞組短語impervious s material 不透水物料impervious earth material 防滲土料impervious liner material 防滲襯層材料dam core impervious material 大壩心墻防滲摻合料hard impervious material 堅硬不透水物料core impervious material 心墻防滲料A material impervious to water 不透水的材料 返回 impervious material