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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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KEY WORDS: spring
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