名词
中文翻译：Unknown
同义词：
['positive ion concentration', 'positive ion ratio', 'positive ion fraction例句：1. The positive ion density in the atmosphere is a key factor in determining weather patterns.（大气中的正离子密度是决定天气模式的关键因素。）']
例句：
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1. The positive ion density in the atmosphere is a key factor in determining weather patterns.
大气中的正离子密度是决定天气模式的关键因素。
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2.In this study, we found that the positive ion density was higher in urban areas than in rural areas.
在这项研究中，我们发现城市地区的正离子密度高于农村地区。
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3. The positive ion density in the region has been increasing due to increased industrial activity.
该地区的正离子密度由于工业活动增加而增加。