磨石 /móshí/ angolul

grindstone▼(wheel for grinding)
noun
[UK: ˈɡraɪnd.stəʊn] [US: ˈɡraɪndˌstoʊn]

millstone [millstones]▼(large round stone used for grinding grain)
noun
[UK: ˈmɪl.stəʊn] [US: ˈmɪlˌstoʊn]

whetstone [whetstones]▼(stone used to hone tools)
noun
[UK: ˈwet.stəʊn] [US: ˈwetˌstoʊn]