Qualcomm's initial products are only bichrome—black lettering on a background of, say, gold.

高通的最初产品只有单色──在背景色（例如金色）上显现黑色。

While the reduction of the initial oxidized products on pyrite surface such as polysulphide and free sulphur can improve its hydrophilicity.

同时，黄铁矿表面初始氧化产物如单质硫和多硫化物被还原，亲水性增强。