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Tourists take photos on a biological exhibition at Qingdao underwater world in Qingdao, east China's Shandong Province, April 29, 2018. People in China spend their Labor Day holiday in various ways. (Xinhua/Li Ziheng)
Tourists take photos on a biological exhibition at Qingdao underwater world in Qingdao, east China's Shandong Province, April 29, 2018. People in China spend their Labor Day holiday in various ways. (Xinhua/Li Ziheng)