Chinese
刀不磨要生锈，人不学要落后 / 刀不磨要生銹，人不學要落後 [dāobùmóyàoshēngxiù, rénbùxuéyàoluòhòu]
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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