Students of the China-Laos Friendship Nongping Primary School visit the Vientiane bridge beam fabrication yard of China Railway No. 2 Engineering Group (CREC-2), the company in charge of the railway construction in Vientiane, Laos, June 1, 2019. The teachers and students of the China-Laos Friendship Nongping Primary School in Lao capital Vientiane observed the International Children's Day on Saturday by going on a tour to the construction site of the China-Laos railway. (Xinhua/Zhang Jianhua)