英语语法分析

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。

The production technique for the crystal calcium polysulphide produced in China at present respectively adopts the crystal parent solution cyclic utilization method.

目前国内生产结晶石硫合剂的生产工艺均采用结晶母液循环利用法。