Photo taken on April 12, 2019 show the construction site of the Pu'er railway station of the China-Laos railway in Pu'er City, southwest China's Yunnan Province,. Linking Yuxi City in Yunnan and the Lao capital Vientiane, the China-Laos railway is expected to be fully operational by the end of 2021. (Xinhua/Qin Qing)