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China's Lin Dan competes during the men's singles first round match against Vietnam's Nguyen Tien Minh at the BWF World Championships 2019 in Basel, Switzerland, Aug. 19, 2019. (Xinhua/Li Jundong)
China's Lin Dan competes during the men's singles first round match against Vietnam's Nguyen Tien Minh at the BWF World Championships 2019 in Basel, Switzerland, Aug. 19, 2019. (Xinhua/Li Jundong)