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A staff plays with dolphins at the Shedd Aquarium in Chicago, the United States, on Feb. 2, 2018. The aquarium contains 32,000 animals and attracts nearly 2 million visitors every year. (Xinhua/Wang Ping)
A staff plays with dolphins at the Shedd Aquarium in Chicago, the United States, on Feb. 2, 2018. The aquarium contains 32,000 animals and attracts nearly 2 million visitors every year. (Xinhua/Wang Ping)