Chui Sai On (C), chief executive of China's Macao Special Administrative Region (SAR), Raimundo Arrais do Rosario (L), secretary for Transport and Public Works of Macao, and Ho Cheong Kei, chairman of the board of Macao Light Rapid Transit (LRT), attend the opening ceremony of the Macao LRT in south China's Macao, Dec. 10, 2019. The Macao LRT was officially put into operation Tuesday. (Xinhua/Cheong Kam Ka)