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備長炭
noun
high-quality charcoal made from the wood of the 姥目樫 (ubamegashi, “ubame oak, Quercus phillyreoides”); white charcoal
備長炭
noun
high-quality charcoal made from the wood of the 姥目樫 (ubamegashi, “ubame oak, Quercus phillyreoides”); white charcoal
磨穿鉄硯
noun
showing unyielding diligence in one's studies; wearing a hole through one's metal inkstone from constant studying