One thing is the balance or ratio between positive and negative ions.
一种情况是正负离子平衡问题，或比率问题。
The treatment method is environment friendly, does not generate pollutant gas or heavy metal ions;
环保型，不产生污染气体和重金属离子；
The treatment method is environment friendly, does not generate pollutant gas or heavy metal ions;
环保型，不产生污染气体和重金属离子；
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