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Students of the China-Laos Friendship Nongping Primary School visit the China-Laos Railway Exhibition Hall 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)