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1. Oxford Dictionary

   grindstone

   • IPA[ˈɡrʌɪn(d)stəʊn]

   英式

   • n.
     a thick disc of stone or other abrasive material mounted so as to revolve, used for grinding, sharpening, or polishing metal objects.；another term for millstone

   • noun: grindstone, plural noun: grindstones

2. • 相關詞
   • 片語

   keep one's nose to the grindstone

   • ph.
     work hard and continuously

   Oxford American Dictionary

   keep one's nose to the grindstone

   • ph.
     work hard and continuously

   Oxford Dictionary

   片語

   • keep one's nose to the grindstone
3. • 更多解釋

   grindstone

   • IPA[ˈɡrīn(d)ˌstōn]

   美式

   • n.
     a thick disk of stone or other abrasive material mounted so as to revolve, used for grinding, ...

   Oxford American Dictionary