A remote control aircraft flies over a smog-enveloped square in Changchun, capital of northeast China's Jilin Province, Oct. 25, 2015. (photo: Xinhua/Lin Hong)
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A remote control aircraft flies over a smog-enveloped square in Changchun, capital of northeast China's Jilin Province, Oct. 25, 2015. (photo: Xinhua/Lin Hong)
