Zhang Ke of Hebei competes during the women's 400m freestyle final at the 2020 Chinese National Swimming Championships in Qingdao, east China's Shandong Province, Oct. 1, 2020. (Xinhua/Chen Jianli)

Yan Zibei of Hubei competes during the men's 200m breaststroke final at the 2020 Chinese National Swimming Championships in Qingdao, east China's Shandong Province, Oct. 1, 2020. (Xinhua/Tao Xiyi)

Ma Yonghui of Hebei competes during the women's 400m freestyle final at the 2020 Chinese National Swimming Championships in Qingdao, east China's Shandong Province, Oct. 1, 2020. (Xinhua/Chen Jianli)

Zhang Ziyang of Hubei competes during the men's 800m freestyle final at the 2020 Chinese National Swimming Championships in Qingdao, east China's Shandong Province, Oct. 1, 2020. (Xinhua/Tao Xiyi)

Zhang Ke of Hebei competes during the women's 400m freestyle final at the 2020 Chinese National Swimming Championships in Qingdao, east China's Shandong Province, Oct. 1, 2020. (Xinhua/Tao Xiyi)

Zhang Ziyang of Hubei competes during the men's 800m freestyle final at the 2020 Chinese National Swimming Championships in Qingdao, east China's Shandong Province, Oct. 1, 2020. (Xinhua/Chen Jianli)

Hu Jia of Shandong competes during the men's 800m freestyle final at the 2020 Chinese National Swimming Championships in Qingdao, east China's Shandong Province, Oct. 1, 2020. (Xinhua/Tao Xiyi)