Guests are invited to control robots during an opening ceremony of an exhibition themed on Smart Living and Greater Bay in Hong Kong, south China, March 1, 2019. The three-day exhibition kicked off in Hong Kong on Friday. A total of 11 innovative technology companies took part in this exhibition to showcase a new living style in the Guangdong-Hong Kong-Macao Greater Bay Area. (Xinhua/Lui Siu Wai)