Visitors view a model of nuclear power plant at the 15th China Hi-Tech Fair in Shenzhen, south China's Guangdong Province, Nov. 16, 2013. Over 3,000 exhibitors from 50 countries and regions participated in the fair which kicked off on Saturday. (Xinhua/Mao Siqian)

People visit the 15th China Hi-Tech Fair in Shenzhen, south China's Guangdong Province, Nov. 16, 2013. Over 3,000 exhibitors from 50 countries and regions participated in the fair which kicked off on Saturday. (Xinhua/Mao Siqian)

Visitors view a panoramic parking system at the 15th China Hi-Tech Fair in Shenzhen, south China's Guangdong Province, Nov. 16, 2013. Over 3,000 exhibitors from 50 countries and regions participated in the fair which kicked off on Saturday. (Xinhua/Mao Siqian)