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.

水洗时的浮岩石头,形成一种破旧的感觉.

All over Pompeii, people lay down on beds of pumice stones, overwhelmed by the gas, and death came quietly to them.

在整个庞贝城，人们躺在浮石床上，被毒气笼罩，死亡悄悄向他们走来。