Ma Jia of China attends a training session at the Tokyo Aquatics Centre in Tokyo, Japan, Aug. 23, 2021. (Xinhua/Zhang Cheng)

Song Lingling of China attends a training session at the Tokyo Aquatics Centre in Tokyo, Japan, Aug. 23, 2021. (Xinhua/Hu Huhu)

Zheng Tao (front) of China attends a training session at the Tokyo Aquatics Centre in Tokyo, Japan, Aug. 23, 2021. (Xinhua/Zhang Cheng)

Chinese athletes attend a training session at the Tokyo Aquatics Centre in Tokyo, Japan, Aug. 23, 2021. (Xinhua/Cheong Kam Ka)

Li Guizhi of China attends a training session at the Tokyo Aquatics Centre in Tokyo, Japan, Aug. 23, 2021. (Xinhua/Hu Huhu)