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绿色北京 清新首都
4 Jun 2019 -  6月5日是世界环境日。今年的环境日由中国主办。首都北京已经采取“铁腕”行动减少污染。短短5年时间内，北京空气中细颗粒物年均浓度下降了35%。成功的秘诀是什么呢？请看视频。
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