pumice
noun [ U ] uk/ˈpʌm.ɪs/ us
浮石，轻石（用来摩擦物体使其光滑）
a type of grey, light stone that is used in pieces or as a powder for rubbing things to make them smooth
Pumice is produced in volcanic eruptions. 浮石是在火山爆发中产生的。
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