名词
中文翻译：次要污染物
同义词：
['subordinate pollutant', 'secondary contaminant']
例句：
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1. The city's air quality has significantly improved since the implementation of stricter emission standards.
自从实施更严格的排放标准以来，城市的空气质量已经显著改善。
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2. The study found that the presence of secondary pollutants in the water can have a significant impact on human health.
研究发现，水中的次要污染物的存在对人的健康有重大影响。
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3. In order to reduce emissions, many industries are now using cleaner technologies and reducing the use ofsecondary pollutants.
为了减少排放，许多行业正在使用更清洁的技术并减少使用次要污染物。