1. Aluminum, chromium, or gold are put into a vacuum tank and heated by a tungsten wire. 
   铝、铬或金放在真空罐内用钨丝加热就一下子变成了蒸气，使整个真空罐充满了金属气体。
2. To coat or cover with aluminum or aluminum paint. 
   加铝皮，涂铝光漆用铝或铝涂料涂或覆盖
3. 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
4. pure theory of law 
   纯粹法学派
5. Aluminum is made from bauxite. 
   铝是从铝土矿中提炼出的。

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