pumice stone
US /ˈpʌm.ɪs stoʊn/
UK /ˈpʌm.ɪs stoʊn/

1.
浮石
a very light, porous volcanic rock used as an abrasive, especially for scrubbing and polishing
:
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She used a pumice stone to smooth her rough heels.
她用浮石磨平粗糙的脚后跟。
•
The artist used powdered pumice stone to create a textured surface on the canvas.
艺术家使用浮石粉末在画布上创造出纹理表面。