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
I'll try again.
我再试一次。
Many good cows have evil calves.
很多好母牛,会生坏小犊。
and having different effects. One poison acts on the nerves, the other on the blood.