Photo taken on May 16, 2017 shows an intelligent robot assembling the cell phone mould during the 4th China Robotop in Yuyao, East China’s Zhejiang province. [Photo/Xinhua]

Visitors view the intelligent digital factory management system during the 4th China Robotop in Yuyao, East China’s Zhejiang province, May 16, 2017. [Photo/Xinhua]

Visitors view a bionic robot during the 4th China Robotop in Yuyao, East China’s Zhejiang province, May 16, 2017. [Photo/Xinhua]