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An electric welder works at a construction site in Lushui, southwest China's Yunnan Province, May 1, 2019, the International Labor Day. (Xinhua/Jiang Wenyao)
An electric welder works at a construction site in Lushui, southwest China's Yunnan Province, May 1, 2019, the International Labor Day. (Xinhua/Jiang Wenyao)