Chinese Word: 刀不磨要生锈，人不学要落后 - Talking Chinese English Dictionary

刀 dāo 不 bù 磨 mó 要 yào 生 shēng 锈 xiù ， , 人 rén 不 bù 学 xué 要 yào 落 luò 后 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)

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