Liu Yuchen, Huang Yaqiong, Zheng Siwei, Chen Qingchen (L-R) are seen during the retirement ceremony held for 4 players of the Chinese Badminton Team in Hangzhou, East China's Zhejiang province, Dec 21. Chen Qingchen, Zheng Siwei, Huang Yaqiong, Liu Yuchen announced their retirement during the ceremony. [Photo/BWF]