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。

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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。

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And they're immersed in an electrolyte made of positive and negative ions dissolved in a solvent.

他们被浸没在正负离子溶于溶剂的电解液中。

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The negative ions, these are electron-rich.

二负离子，它们有富裕的电子。

麻省理工公开课 - 固态化学导论课程节选

But, can you see that as you get really close together the negative electronic cloud surrounding the two ions start to sense one another.

然后当你真的让它们,离得很近时,这两个离子周围的负电子云能感应到对方。

麻省理工公开课 - 固态化学导论课程节选

The process is repeated to build up alternating layers of positive and negative ions on top of each other.

ECONOMIST: MONITOR

By using atmospheric air and negative ions, a natural cleansing agent, it fights dirt and bacteria with nature's own weapon, he said.

CNN: Ioning your way to cleaner clothes

National University of Singapore industrial design students Gabriel Tan and Wendy Chua's prototype uses negative ions, compressed air and anti-bacterial deodorants to clean clothes.

CNN: Ioning your way to cleaner clothes