Chinese
磨穿铁砚 / 磨穿鐵硯 [móchuāntiěyàn]
to grind one's way through an ink stone; to persevere in a difficult task (idiom); to study diligently (idiom)
Japanese
showing unyielding diligence in one's studies; (literal) wearing a hole through one's metal inkstone from constant studying
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