Cattle manure and calcium superphosphate were main pollutingmaterial.
牛粪、过钙是基质中主要镉污染物质。
2
The release of material non-toxic non-polluting materials, with fire and wear-resistant and anti-erosion function;
材质采用无毒无污染释放的材料，具有防火和耐磨损和防侵蚀的功能；
3
Physicists are studying new ways of generating electricity with less damage to the environment. In the meantime, many power plants are being modernized to give off less pollutingmaterial.