Artists perform during a grand gala in celebration of the 20th anniversary of Macao's return to the motherland in the Macao East Asian Games Dome, south China's Macao, Dec. 19, 2019. (Xinhua/Pang Xinglei)

Artists perform during a grand gala in celebration of the 20th anniversary of Macao's return to the motherland in the Macao East Asian Games Dome, south China's Macao, Dec. 19, 2019. (Xinhua/Yan Yan)

Artists perform during a grand gala in celebration of the 20th anniversary of Macao's return to the motherland in the Macao East Asian Games Dome, south China's Macao, Dec. 19, 2019. (Xinhua/Pang Xinglei)

Artists perform during a grand gala in celebration of the 20th anniversary of Macao's return to the motherland in the Macao East Asian Games Dome, south China's Macao, Dec. 19, 2019. (Xinhua/Pang Xinglei)

Artists perform during a grand gala in celebration of the 20th anniversary of Macao's return to the motherland in the Macao East Asian Games Dome, south China's Macao, Dec. 19, 2019. (Xinhua/Yan Yan)

Artists perform during a grand gala in celebration of the 20th anniversary of Macao's return to the motherland in the Macao East Asian Games Dome, south China's Macao, Dec. 19, 2019. (Xinhua/Pang Xinglei)

Artists perform during a grand gala in celebration of the 20th anniversary of Macao's return to the motherland in the Macao East Asian Games Dome, south China's Macao, Dec. 19, 2019. (Xinhua/Pang Xinglei)

Artists perform during a grand gala in celebration of the 20th anniversary of Macao's return to the motherland in the Macao East Asian Games Dome, south China's Macao, Dec. 19, 2019. (Xinhua/Pang Xinglei)

Artists perform during a grand gala in celebration of the 20th anniversary of Macao's return to the motherland in the Macao East Asian Games Dome, south China's Macao, Dec. 19, 2019. (Xinhua/Pang Xinglei)

Artists perform during a grand gala in celebration of the 20th anniversary of Macao's return to the motherland in the Macao East Asian Games Dome, south China's Macao, Dec. 19, 2019. (Xinhua/Pang Xinglei)

Artists perform during a grand gala in celebration of the 20th anniversary of Macao's return to the motherland in the Macao East Asian Games Dome, south China's Macao, Dec. 19, 2019. (Xinhua/Pang Xinglei)

Artists perform during a grand gala in celebration of the 20th anniversary of Macao's return to the motherland in the Macao East Asian Games Dome, south China's Macao, Dec. 19, 2019. (Xinhua/Pang Xinglei)

Artists perform during a grand gala in celebration of the 20th anniversary of Macao's return to the motherland in the Macao East Asian Games Dome, south China's Macao, Dec. 19, 2019. (Xinhua/Pang Xinglei)

Artists perform during a grand gala in celebration of the 20th anniversary of Macao's return to the motherland in the Macao East Asian Games Dome, south China's Macao, Dec. 19, 2019. (Xinhua/Pang Xinglei)

Artists perform during a grand gala in celebration of the 20th anniversary of Macao's return to the motherland in the Macao East Asian Games Dome, south China's Macao, Dec. 19, 2019. (Xinhua/Pang Xinglei)