Staff members work during a testing program for the 2022 Olympic and Paralympic Winter Games to root out problems and accumulate data at the Genting Snow Park in Chongli District of Zhangjiakou, north China's Hebei Province, Feb. 19, 2021. (Xinhua/He Changshan)

Staff members collect data during a testing program for the 2022 Olympic and Paralympic Winter Games to root out problems and accumulate data at the Genting Snow Park in Chongli District of Zhangjiakou, north China's Hebei Province, Feb. 19, 2021. (Xinhua/He Changshan)

Staff members transport equipment during a testing program for the 2022 Olympic and Paralympic Winter Games to root out problems and accumulate data at the Genting Snow Park in Chongli District of Zhangjiakou, north China's Hebei Province, Feb. 19, 2021. (Xinhua/He Changshan)

An athelete participates in a testing program for the 2022 Olympic and Paralympic Winter Games to root out problems and accumulate data at the National Sliding Center in Yanqing District, Beijing, capital of China, Feb. 19, 2021. (Xinhua/Zhang Chenlin)

A staff member makes records of temperature data during a testing program for the 2022 Olympic and Paralympic Winter Games to root out problems and accumulate data at the National Sliding Center in Yanqing District, Beijing, capital of China, Feb. 20, 2021. (Xinhua/Zhang Chenlin)

Members from medical group are seen during a testing program for the 2022 Olympic and Paralympic Winter Games to root out problems and accumulate data at the National Alpine Skiing Center in Yanqing District, Beijing, capital of China, Feb. 20, 2021. (Xinhua/Zhang Chenlin)

Staff members work on the track during a testing program for the 2022 Olympic and Paralympic Winter Games to root out problems and accumulate data at the National Sliding Center in Yanqing District, Beijing, capital of China, Feb. 20, 2021. (Xinhua/Zhang Chenlin)