Pumice

(noun.) a light glass formed on the surface of some lavas; used as an abrasive.

(verb.) rub with pumice, in order to clean or to smoothen.

阿纳托尔校对

• The walls of the ditch were brilliant with yellow banks of sulphur and with lava and pumice-stone of many colors. 马克·吐温. 傻子出国记.
• Repeat until clean, then polish with pumice stone continually moistened with water as you proceed. 威廉K.戴维. 智者、化学家和伟大医生的秘密.
• Mr. Franklin scraped off all the nice varnish with pumice-stone, and made what he described as a surface to work on. 威尔基·柯林斯. 月亮宝石.
• The path led straight up a rugged sweep of loose chunks of pumice-stone, and for about every two steps forward we took, we slid back one. 马克·吐温. 傻子出国记.
• Drift, sand, rubble, boulders, come next; and finally volcanic products, like lava, ashes, pumice. 李贝. 西洋科学史.

整理:马库斯