The slightly porous nature of the surface of the oxide film allows it to be coloured with either organic or inorganic dye . 氧化膜表面具有轻微的渗透性，因而可以用有机或无机染料着色。
2.
The slightly porous nature of the surface of the oxide film allows it to be colored with either organic or inorganic dyes 氧化膜表面具有轻微的渗透性，因此可以用有机或无机染料着色。
