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Zhang Jun(L), coach of Zheng Siwei/Huang Yaqiong(R) of China, reacts during the mixed doubles quaterfinal match against Mathias Christiansen/Sara Thygesen of Denmark at Sudirman Cup 2019 in Nanning, south China's Guangxi Zhuang Autonomous Region on May 23, 2019. (Xinhua/Liu Xu)