Photo taken on April 29, 2019 shows the Malanshan Video Cultural and Creative Industrial Park in Changsha, central China's Hunan Province. [Photo by Chen Sihan/Xinhua]
A staff member of Zoomlion, one of China's largest heavy machinery companies, introduces a robotic cleaner in Changsha, central China's Hunan Province, April 28, 2019. [Photo by Chen Sihan/Xinhua]