Workers are seen at a construction site on the Lhasa-Nyingchi section of the Sichuan-Tibet Railway in Southwest China's Tibet autonomous region, Dec 23, 2018. [Photo/Xinhua]
Workers are seen at a construction site of the Yarlung Zangbo River bridge on the Lhasa-Nyingchi section of the Sichuan-Tibet Railway in Gonggar of Southwest China's Tibet autonomous region, Dec 22, 2018. [Photo/Xinhua]
Photo taken on Dec 23, 2018 shows a construction site on the Lhasa-Nyingchi section of the Sichuan-Tibet Railway in Southwest China's Tibet autonomous region. [Photo/Xinhua]
Workers are seen at a construction site on the Lhasa-Nyingchi section of the Sichuan-Tibet Railway in Southwest China's Tibet autonomous region, Dec 23, 2018. [Photo/Xinhua]