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inoh

keep one's nose to the grindstone

/ˌkip wʌnz ˈnoʊz tə ðə ˈɡɹaɪndˌstoʊn/

to work very hard and continuously without stopping

“One must keep one's nose to the grindstone to succeed.”
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Hình minh họa cho keep one's nose to the grindstone: to work very hard and continuously without stopping