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A student looks at a three dimensional printer in Lianyungang, east China's Jiangsu Province, Sept. 16, 2017. A variety of activities of popularization of science were held across the county. (Xinhua/Geng Yuhe)
A student looks at a three dimensional printer in Lianyungang, east China's Jiangsu Province, Sept. 16, 2017. A variety of activities of popularization of science were held across the county. (Xinhua/Geng Yuhe)