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Tourists visit a beach in Haikou, south China's Hainan Province, May 1, 2019, the first day of four-day May Day holiday. (Xinhua/Guo Cheng)
Tourists visit a beach in Haikou, south China's Hainan Province, May 1, 2019, the first day of four-day May Day holiday. (Xinhua/Guo Cheng)