Xu Jiayu, Yan Zibei, Zhang Yufei and Yang Junxuan (L to R) of Jiangsu-Zhejiang-Shandong-Hubei united team pose during the awarding ceremony of the mixed 4x100m medley relay at the 2021 Chinese National Swimming Championships in Qingdao, east China's Shandong Province, May 7, 2021. (Xinhua/Xu Chang)
