A visitor listens to introduction while visiting the 17th China Hi-tech Fair in Shenzhen, south China's Guangdong Province, Nov. 17, 2015. (Xinhua/Mao Siqian)
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A visitor listens to introduction while visiting the 17th China Hi-tech Fair in Shenzhen, south China's Guangdong Province, Nov. 17, 2015. (Xinhua/Mao Siqian)
