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A worker polishes a drill at a construction site in a tunnel in Wu'an, north China's Hebei Province, May 1, 2019, the International Labor Day. (Xinhua/Wang Xiao)
A worker polishes a drill at a construction site in a tunnel in Wu'an, north China's Hebei Province, May 1, 2019, the International Labor Day. (Xinhua/Wang Xiao)