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Workers install a pipeline at a construction site in Dianzhong New Area, southwest China's Yunnan Province, May 1, 2019, the International Labor Day. (Xinhua/Hu Chao)
Workers install a pipeline at a construction site in Dianzhong New Area, southwest China's Yunnan Province, May 1, 2019, the International Labor Day. (Xinhua/Hu Chao)