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Tourists visit the Shanghai Ocean Aquarium in east China's Shanghai, May 1, 2019. Tourism boosts as many people go out for recreational activities during China's four-day Labor Day national holiday. (Xinhua/Liu Ying)
Tourists visit the Shanghai Ocean Aquarium in east China's Shanghai, May 1, 2019. Tourism boosts as many people go out for recreational activities during China's four-day Labor Day national holiday. (Xinhua/Liu Ying)