Worker Wu Yuanbo (R) and colleagues test the compaction degree of the roadbed of the under-construction Pu'er railway station of the China-Laos railway in Pu'er City, southwest China's Yunnan Province, April 12, 2019. 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)