1. An extremely hard mineral, aluminum oxide, Al2O3, 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，al2o3，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
2. A magnesia-rich sedimentary rock resembling limestone. 
   白云灰岩一种似石炭岩，富含氧化镁的沉积岩
3. A substance, such as magnesia or sodium bicarbonate, that neutralizes acid. 
   解酸剂，抗酸剂，防酸剂一种中和酸的物质，如氧化镁或碳酸氢钠
4. A suspension of particles in a liquid, such as milk of magnesia. 
   乳剂液体中的悬浮物质，诸如镁乳
5. black looks; black words. 
   愠怒的眼光；愠怒的语言。

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