Fireworks are seen during the opening day of "Spasskaya Tower" International Military Music Festival in Moscow, Russia, on Aug. 23, 2019. (Xinhua/Bai Xueqi)

Aerial photo taken on Aug. 23, 2019 shows a group of students with their parents from Beijing taking part in a summer vacation activity featuring desertification control to enhance environmental awareness at the Shapotou desert-themed scenic spot in Zhongwei City, northwest China's Ningxia Hui Autonomous Region. (Xinhua/Feng Kaihua)

Serbia's Nikola Jokic reacts during a match against Italy at 2019 Shenyang International Basketball Championship in Shenyang, northeast China's Liaoning Province, Aug. 23, 2019. (Xinhua/Pan Yulong)

People are seen at the square outside Bilbao Guggenheim Museum in Bilbao, Spain, Aug. 23, 2019. (Xinhua/Guo Qiuda)

A keeper takes care of the female cub of panda Hao Hao during a media view at Pairi Daiza zoo in Brugelette, Belgium, Aug. 24, 2019. (Xinhua/Zheng Huansong)

People attend a cleansing ceremony at Buckroe Beach in Hampton, Virginia, the United States, on Aug. 24, 2019. (Xinhua/Liu Jie)

Indian devotees form a human pyramid in an attempt to reach and break a 'dahi-handi' (curd-pot) during the Janmashtami Festival in Mumbai, India, Aug. 24, 2019. (Photo by Fariha Farooqui/Xinhua)

Artists from China Disabled People's Performing Art Troupe perform dance to celebrate the 70th anniversary of the founding of the People's Republic of China and the 20th anniversary of Macao's return to the motherland, in south China's Macao, Aug. 24, 2019. (Xinhua/Cheong Kam Ka)

Young people from south China's Hong Kong visit the Chengdu Museum in Chengdu, southwest China's Sichuan Province, Aug. 24, 2019. (Xinhua/Liu Kun)

Visitors take photos as Chinese characters are shown on electronic screens in an exhibition on Chinese characters in National Museum of China in Beijing, capital of China, Aug. 24, 2019. (Xinhua/Shen Bohan)

People watch the Bucharest International Air Show in Bucharest, Romania, on Aug. 24, 2019. (Photo by Cristian Cristel/Xinhua)

People wave flags during an event organized by Hong Kong Chinese Enterprises Association to unite families in their calls for order and harmony in the Ocean Park, south China's Hong Kong, Aug. 24, 2019. (Xinhua/Lu Hanxin)

A Syrian soldier flashes the victory sign in the town of Khan Shaykhun in the southern countryside of Idlib province, Syria, on Aug. 24, 2019. (Photo by Ammar Safarjalani/Xinhua)