北京市环保局总工程师于建华承认，去年空气质量的提升没有大到可以改变居民对整体空气质量的感觉。
Yu Jianhua, the Beijing environmental bureau's chief engineer, conceded that the improvements made last year were "not huge enough" to change residents' perception of overall air quality.
北京市环保局总工程师于建华承认，去年空气质量的提升没有大到可以改变居民对整体空气质量的感觉。
Yu Jianhua, the Beijing environmental bureau's chief engineer, conceded that the improvements made last year were "not huge enough" to change residents' perception of overall air quality.
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