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
Chinese students pick up garbage from parks and public surfaces around the Blok 70 neighborhood in Belgrade, Serbia, on May 1, 2019, the International Labor Day. (Xinhua/Nemanja Cabric)
Chinese students pick up garbage from parks and public surfaces around the Blok 70 neighborhood in Belgrade, Serbia, on May 1, 2019, the International Labor Day. (Xinhua/Nemanja Cabric)