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。
At this time, the air is very fresh with lots of beneficial negative ions.
空气在这段时间当中富含有益的负离子，因此非常新鲜。
There are no known negative side effects of negative ions .
没有已知的负离子的负面影响。
It can improve air quality through increasing negative ions in air.
通过增加空气中的负离子量改善空气质量。
Positive and negative ions fixed in a solid do not conduct a current.
固定在固体中的正离子和负离子不导电。
Positive and negative ions in a solution can move and conduct a current .
溶液中的正离子和负离子可以移动并且导电。
Positive and negative ions in a solution can move and conduct a current .
溶液中的正离子和负离子可以移动并且导电。
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