1. He sharpened the edge of his knife on a grindstone. 
   他在磨石上磨快了他的刀刃。
2. His large growing family kept his nose to the grindstone. 
   他的日益增多的家庭人口使他埋头从事辛苦的工作。
3. It's a pity I have to get back to the grindstone. 
   遗憾的是我不得不回去工作。
4. Jim's father succeeded in business by keeping his nose to the grindstone. 
   吉姆的父亲埋头苦干，努力不懈，从而在事业上获得了成功。
5. The crank used to give motion to a grindstone or similar device. 
   摇柄，曲柄用于给石磨或其他装置施力的把手

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