单词 | 极为坚硬 |
释义 | 〔corundum〕An extremely hard mineral, aluminum oxide, Al2O 3, sometimes containing iron, magnesia, or silica, that occurs in gem varieties such as ruby and sapphire and in a common black, brown, or blue form used chiefly in abrasives. 刚玉:一种极为坚硬的矿物,氧化铝,Al2O 3,有时含铁、氧化镁或硅土,存在于各种宝石中,如红宝石、蓝宝石,并且在磨蚀剂中以普通的黑色、棕色或蓝色形式出现 |
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