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BNC: 37127 COCA: 30886

grindstone

noun
/ˈɡraɪndstəʊn/
/ˈɡraɪndstəʊn/
Idioms
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  1. a round stone that is turned like a wheel and is used to make knives and other tools sharp磨石;砂轮
Idioms
keep your nose to the grindstone
  1. (informal) to work hard for a long period of time without stopping连续辛勤地工作

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