grindstone是什么意思 n. 磨石, 砂轮, 石磨[机] 磨石 n. a revolving stone shaped like a disk; used to grind or sharpen or polish edge tools grindstone的用法和例句: 1. She's obviously had her nose to the grindstone in the gym. 很明显她一直在训练馆里埋头苦练...