A staff member shows a 3D printing pen with real-time view through AR technology during Hong Kong Electronics Fair in south China's Hong Kong, April 13, 2017. The four-day fair kicked off here Thursday. (Xinhua/Wang Xi)
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A staff member shows a 3D printing pen with real-time view through AR technology during Hong Kong Electronics Fair in south China's Hong Kong, April 13, 2017. The four-day fair kicked off here Thursday. (Xinhua/Wang Xi)
