1. A red residual soil in humid tropical and subtropical regions that is leached of soluble minerals, aluminum hydroxides, and silica but still contains concentrations of iron oxides and iron hydroxides. 
   红土湿润的热带或亚热带地区的红色残留土，被雨水冲掉了可溶性矿物质、氢氧化铝和二氧化硅，但是仍保留了氧化铁和氢氧化铁
2. Hydrogen and oxygen combine to form water. 
   氢和氧化合形成水。
3. Hydrogen combines with oxygen to form water. 
   氢与氧化合形成水。
4. The principal ore of aluminum, composed mainly of hydrous aluminum oxides and aluminum hydroxides. 
   铝土矿铝的基本矿石，由含水的氧化铝和氢氧化铝组成
5. 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

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