grindstone
n
1 stone shaped like a wheel, turned on an axle, against which one holds knives or other tools to sharpen them 砂輪.
2 (idm 習(xí)語) keep one's/sb's nose to the grindstone => nose1.
??? 情景例句
That'll be our first one,
這將成為我們的第一件,
Nothing is so certain as the unexpected.
天有不測(cè)風(fēng)云,人有旦夕禍福。
The thieves dropped the torch and ran away as quickly as they could.