1. 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
2. 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
3. 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
4. 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
5. Any of various techniques for the separation of complex mixtures that rely on the differential affinities of substances for a gas or liquid mobile medium and for a stationary adsorbing medium through which they pass, such as paper, gelatin, or magnesia. 
   色谱法分离复杂混合物的多种技术，依靠物质对于气体或液体运动介质和静止的吸附介质（如纸、凝胶或氧化镁）的不同亲和力达到分离

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• 1. 氧化镁
  magnesia cement 镁氧水泥...magnesia 氧化镁...magnesial 镁质的
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• 2. 氧化铨，菱镁矿，镁土
  magnescope 放像镜...magnesia 氧化铨，菱镁矿，镁土...magnesium (Mg)镁
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• 3. 气化镁
  气割 scarfing...气化镁 magnesia...气化镁烧结物 magnesia clinker
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• 4. 镁砂
  方镁石periclase...镁砂magnesia...合成镁砂synthetic sintered magnesia
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