据北京环卫工程集团有限公司运营管理部主任陈宝山表示称,这一现象的原因是因为公众对空气质量的认识日益加强。
Chen Baoshan, chief of the operations management department of Beijing Environment Sanitation Engineering Group Co. Ltd, attributed the decline to the growing public awareness of air quality.
据北京环卫工程集团有限公司运营管理部主任陈宝山表示称,这一现象的原因是因为公众对空气质量的认识日益加强。
Chen Baoshan, chief of the operations management department of Beijing Environment Sanitation Engineering Group Co. Ltd, attributed the decline to the growing public awareness of air quality.
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