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Meaning of 刀不磨要生锈,人不学要落后

Lookup via: Pinyin | Radicals
dāo yào shēng xiù , rén xué yào luò hòu (Trad.: 刀不磨要生銹,人不學要落後)
a blade will get rusty if it is not sharpened; a man will fall behind if he doesn't study (idiom)