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. A metallurgical coating process in which iron or steel is immersed in a powder of another metal, such as zinc, chromium, or aluminum, and heated to a temperature below the melting point of either. 
   渗碳处理一种冶金镀膜工序，在此工序中把钢或铁浸入另一种金属如锌、铬或铝的粉剂里，并加热至这一金属的熔点温度以下
3. Chromium or a chromium alloy. 
   铬或铬合金
4. A pigment containing chromium. 
   含铬的染料
5. treat with a chromium compound. 
   用铬化合物进行处理。

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