A child tries a 3D printing pen during a visit to an interactive museum for 3D printing in Yantai, east China's Shandong Province, Dec. 10, 2016. (Photo:Xinhua/Tang Ke)
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A child tries a 3D printing pen during a visit to an interactive museum for 3D printing in Yantai, east China's Shandong Province, Dec. 10, 2016. (Photo:Xinhua/Tang Ke)
