Fireworks explode over the sky in south China's Macao, 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. Photo:Xinhua

Fireworks explode over the sky in south China's Macao, 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. Photo:Xinhua

Fireworks explode over the sky in south China's Macao, 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. Photo:Xinhua

Fireworks explode over the sky in south China's Macao, 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. Photo:Xinhua

Fireworks explode over the sky in south China's Macao, 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. Photo:Xinhua