Kindergarten students play at China-Laos Friendship School in Muang Xay, Laos, March 22, 2019. (Photos: Xinhua)

Xu Shunhong works in his office at China-Laos Friendship School in Muang Xay of Laos, March 22, 2019.

Students salute while the national flag is being lowered at China-Laos Friendship School in Muang Xay of Laos, March 22, 2019.

Students prepare to leave school after one week's study at China-Laos Friendship School in Muang Xay of Laos, March 22, 2019.

A teacher escorts kindergarten children to their parents after school at China-Laos Friendship School in Muang Xay of Laos, March 22, 2019.

Kindergarten students walk in a row to enjoy recreation class at China-Laos Friendship School in Muang Xay of Laos, March 22, 2019.