n.浮石；浮岩
v.用浮石磨；用轻石擦净
Add only a little alcohol and pumice as you work. 每次只要加很少的酒精和浮石粉。
Lake Taupo's shore is covered with pieces of pumice. 陶波湖岸上布满了一片片的浮石。
The wall was built by piling up pumice stones. 这面墙是用浮岩垒成的。
Pumice stones are used in the wash to create a worn look. 水洗时用浮岩石头会带来一种破旧的感觉。
