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Mitis [Mitis 词源字典]: "Attributive, especially in Mitis casting. Designating pure iron made fluid enough for casting by the addition of a very small quantity of aluminium; (also) designating this method of production or a casting made by this method", Late 19th cent. From classical Latin mītis mild, after the sense of mild in mild steel.[Mitis etymology, Mitis origin, 英语词源]