The opening day of the 10th China Flower Expo sees over 20,000 visitors, in Shanghai, east China, May 21, 2021. /CFP

Robot soccer players are seen at a soccer game during the 2021 RoboCup China Open, also known as the RoboCup Asia-Pacific (RCAP) Tianjin Invitation Tournament, as part of the fifth World Intelligence Congress, in Tianjin, north China, May 21, 2021. /CFP

Rescuers are seen ready to depart for the earthquake-hit area after a magnitude-7.4 quake hit Maduo County of Golog Tibetan Autonomous Prefecture, northwest China's Qinghai Province, May 22, 2021.  /CFP

China's first Mars rover Zhurong is depicted to be roaming on the surface of Mars after driving down from space probe Tianwen-1 as shown in this artistic rendering made available by the China National Space Administration, May 22, 2021. /CFP

A third round of nucleic acid testing for COVID-19 began last week in the city of Lu'an, Anhui Province, east China, May 22, 2021. /CFP

China's globally renowned agronomist Yuan Longping, known for developing the first hybrid rice strains, died of organ failure at the age of 91 and people are seen lined up to offer flowers to Yuan outside the Mingyangshan funeral parlor in Changsha, Hunan Province, central China, May 22, 2021. /CFP