有毒重金属是主要污染物之一。
深入研究主要污染物减排与环境质量改善的关系。
We should thoroughly study the relationship between reduction of major pollutants and improvement of environmental quality.
主要污染物有矿渣，污水，烟气、尾气等。
The main pollution sources include: slag, sewage water, smoke, and tail gas.
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