Maintenance workers check the tracks at the Xinguanjiao Tunnel, the world's longest plateau rail tunnel, along the Qinghai-Tibet Railway in northwest China's Qinghai Province, June 27, 2018. (Xinhua/Hou Deqiang)
Weekly choices of Xinhua photo
Source: Xinhua| 2018-07-01 14:45:32|Editor: Chengcheng