Jin Yan (L) of Tianjin-Liaoning-Sichuan united team, Xu Jiayu (C) of Zhejiang-Hubei united team and Liu Zongyu of Shandong team prepare before the men's 4x100m medley relay final at the 2021 Chinese National Swimming Championships in Qingdao, east China's Shandong Province, May 8, 2021. (Xinhua/Xu Chang)
