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
Birds of a feather flock together.
物以类聚。
I seldom write a letter.
我很少写信。
I see, we'll take another look at your specifications.