我准备把汽车上的镀铬部件擦亮。 I am going to rub up the chromium on the car.
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 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.
