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An exhibitor presents a DIY air purifier to visitors on the International Innovation Fair in Haidian District of Beijing, capital of China, Oct. 13, 2018. (Xinhua/Luo Xiaoguang)
An exhibitor presents a DIY air purifier to visitors on the International Innovation Fair in Haidian District of Beijing, capital of China, Oct. 13, 2018. (Xinhua/Luo Xiaoguang)