![Visitors enjoy 17th China Hi-tech Fair in Shenzhen(2/5)](http://www.ecns.cn/hd/2015/11/18/283e6c1f59f74c288c21a1cea54894b3.jpg)
A visitor takes photos of a floating device during the 17th China Hi-tech Fair in Shenzhen, south China's Guangdong Province, Nov. 17, 2015. (Xinhua/Mao Siqian)
A visitor takes photos of a floating device during the 17th China Hi-tech Fair in Shenzhen, south China's Guangdong Province, Nov. 17, 2015. (Xinhua/Mao Siqian)