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China's Cai Yanyan returns the shuttle during the women's singles 2nd round match against South Korea's Kim Ga Eun at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019. (Xinhua/Li Jundong)
China's Cai Yanyan returns the shuttle during the women's singles 2nd round match against South Korea's Kim Ga Eun at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019. (Xinhua/Li Jundong)