pumicen.浮石；浮岩v.用浮石磨；用轻石擦净pumiceous concrete浮石混凝土pumice-slag brick浮石渣砖pumiceous structure泡沫构造pumice fall deposit浮石下落堆积层,浮岩雨沉积pumice stone concrete浮石混凝土pumice grinding grease浮石研磨膏pumice insulation brick浮石保温砖pumice polishing grease浮石抛光膏pumice of Changbai Mountain长白山浮石Pumice light - weight aggregate浮石轻骨料