Photo taken on Nov 9, 2017 shows the highway linking Lhasa to Nyingchi over Nyang River in Lhasa, Southwest China’s Tibet autonomous region. Highways have been built to improve transportation in Tibet.[Photo/Xinhua]

Photo taken on Sept 27, 2017 shows the highway linking Xigaze City to Xigaze Airport in Xigaze City, Southwest China’s Tibet autonomous region. Highways have been built to improve transportation in Tibet. [Photo/Xinhua]

Photo taken on May 11, 2017 shows the highway which runs near Lalu wetland in Lhasa, Southwest China’s Tibet autonomous region. Highways have been built to improve transportation in Tibet.[Photo/Xinhua]

Photo taken on May 11, 2017 shows the highway which runs near Lalu wetland in Lhasa, Southwest China’s Tibet autonomous region. Highways have been built to improve transportation in Tibet. [Photo/Xinhua]