名词
中文翻译：次级污染物
同义词：
['subordinate pollutant', 'secondary contaminant']
例句：
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1. Thecity's air quality has improved significantlysince the implementation of stricter emission standards.
自从实施了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 foundthat certain types of plastics are significantsecondary pollutants in the environment.
研究发现，某些类型的塑料是环境中的显著次级污染物。
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3. The government is working on aplan to reduce the levels of secondary pollutants in the waterways.
政府正在制定计划以减少水体中的次级污染物水平。