Xiamen University in Fujian province has sent 296 students in 22 consecutive years to educate children in remote areas of the Ningxia Hui autonomous region.
Since 2017, five to eight college students have traveled to Minning township in Yinchuan for two weeks of the summer break to run after-school hobby clubs for local kids.
Wang Wentao, who is 9 and a half years old, said he learned about paper Mobius strips while attending a hobby club.
"Unlike normal paper, the strip has a surface of only one-sided," he said. "I think it's very interesting. I want to know more interesting things in the world."
In addition to teaching math, the college students teach painting, reading and science, among other things.
College student Jiang Pengzhou said that she liked the photos shared by her peers from visits in previous years and decided to join them.
"It's important for the children in remote areas to know that there's a bigger world outside their villages," said Jiang. "Our support education will plant seeds in their dreams, and someday those seed may sprout and their dreams may come true."