Waste plastics in the environment is called"gray pollution"as a result of difficult degradation and when dis-posed by incineration,secondary pollutants are released.
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gray pollution
灰色污染
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Beijing's air has been a hot topic over the past month because of especially bad bouts of pollution turning the city into a gray landscape.
NPR: Leaner New Year: China Tones Down The Celebrations
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