pumice stone
noun[C]
uk/ˈpʌm.ɪs ˌstəʊn/us/ˈpʌm.ɪs ˌstoʊn/apieceofpumiceused forrubbingthings to make themsmooth:
浮石，轻石（用来摩擦物体使其光滑）You can use apumicestonein thebathtoremovedryskinfromyourfeet.你洗澡时可以用浮石去除脚上干燥的死皮。
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Geology: types of rock
- arenaceous
- arenite
- asthenosphere
- asthenospheric
- basaltic
- borax
- chalk
- emery
- feldspar
- flint
- lahar
- limestone
- magma
- marcasite
- marl
- marmoreal
- metamorphic
- pumice
- scour
- soapstone
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Making things more or less smooth or straight