Technicians work on a second generation disinfection robot in a technological company in Qingdao, east China's Shandong Province, Feb. 11, 2020. Qingdao has called on technological companies to research, develop and refit disinfection robots which can replace human in disinfection operations. Some of the robots have been put into use in the isolation areas of several hospitals. (Xinhua/Li Ziheng)

Technicians work on a second generation disinfection robot in a technological company in Qingdao, east China's Shandong Province, Feb. 11, 2020. Qingdao has called on technological companies to research, develop and refit disinfection robots which can replace human in disinfection operations. Some of the robots have been put into use in the isolation areas of several hospitals. (Xinhua/Li Ziheng)

Technicians work on a second generation disinfection robot in a technological company in Qingdao, east China's Shandong Province, Feb. 11, 2020. Qingdao has called on technological companies to research, develop and refit disinfection robots which can replace human in disinfection operations. Some of the robots have been put into use in the isolation areas of several hospitals. (Xinhua/Li Ziheng)

Technicians work on a second generation disinfection robot in a technological company in Qingdao, east China's Shandong Province, Feb. 11, 2020. Qingdao has called on technological companies to research, develop and refit disinfection robots which can replace human in disinfection operations. Some of the robots have been put into use in the isolation areas of several hospitals. (Xinhua/Li Ziheng)