磨刀石 /módāoshí/ angolul

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

hone [hones]▼(sharpening stone)
noun
[UK: həʊn] [US: ˈhoʊn]

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