(191222) -- ZHUHAI, Dec. 22, 2019 (Xinhua) -- Fireworks explode over the sky in Zhuhai, south China's Guangdong Province, Dec. 22, 2019. Macao and its neighboring city Zhuhai jointly held a firework show to celebrate the 20th anniversary of Macao's return to the motherland on Sunday. (Xinhua/Huang Guobao)