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A beluga whale called Mila performs at the Harbin Polarland in Harbin, capital of northeast China's Heilongjiang Province, Oct. 2, 2019. (Photo by Xie Jianfei/Xinhua)

A beluga whale called Mila performs at the Harbin Polarland in Harbin, capital of northeast China's Heilongjiang Province, Oct. 2, 2019. (Photo by Xie Jianfei/Xinhua)