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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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