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People enjoy warm spring day on campus in Philadelphia, U.S. 

        

        
 Source: Xinhua| 2018-04-15 10:40:11|Editor:  Liangyu 

        

              
        

        

        

        

        

        
    

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        U.S.-PHILADELPHIA-SPRING-BLOSSOM
        

        People enjoy a warm spring day on the campus of University of Pennsylvania in Philadelphia, the United States, April 14, 2018. (Xinhua/Wang Ying) 
        

        

        

        


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