名词
中文翻译：负离子密度计
同义词：
['neutral ion density meter', 'negative ion analyzer']
例句：
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1. This instrument is used to measure the concentration of negative ions in the air.
这个仪器用于测量空气中负离子的浓度。
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2.The study of negative ions is important for understanding the properties of the Earth's atmosphere.
研究负离子对于理解地球大气的性质非常重要。
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3. The negative-ion densitometer was used to detect pollution in the city's air.
使用负离子密度计检测了城市空气中的污染。