2015年12月19日,在北京市朝阳区三里屯街头,一名行人带着粉色的口罩防雾霾。[中国网 郭翊明 摄] A woman wearing a pink face mask braves the smog on a Sanlitun street in Beijing's eastern Chaoyang District on Dec. 19, 2015. [Photo by Guo Yiming/China.org.cn]
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