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A laborer smiles while working at T3 terminal of Gonggar Airport under construction in Gonggar County, southwest China's Tibet Autonomous Region, Dec. 29, 2019. (Xinhua/Zhang Rufeng)
A laborer smiles while working at T3 terminal of Gonggar Airport under construction in Gonggar County, southwest China's Tibet Autonomous Region, Dec. 29, 2019. (Xinhua/Zhang Rufeng)