grindstone
n
1 stone shaped like a wheel, turned on an axle, against which one holds knives or other tools to sharpen them 砂轮.
2 (idm 习语) keep one's/sb's nose to the grindstone => nose1.
🗣️ 情景例句
Here I am.
我在这儿!
What? I'm right, aren't I?
怎样?我没说错吧!
and the railway of the future may well be the 'hovertrain',