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Katie Ledecky of the United States competes during the women's 400m freestyle final at the Gwangju 2019 FINA World Championships in Gwangju, South Korea, July 21, 2019. (Xinhua/Li Gang)
 
 
Katie Ledecky of the United States competes during the women's 400m freestyle final at the Gwangju 2019 FINA World Championships in Gwangju, South Korea, July 21, 2019. (Xinhua/Li Gang)
 
    
Summer scenery at Maoshan village in Huairou District of Beijing
 
    
Two giant pandas give birth to two pairs of twins at zoo in Chongqing
 
    
Scenery along highway linking Lhasa with Nyingchi in southwest China's Tibet
 
    
Palace Museum launches digital products to transform cultural heritages into digital resources