Traveling nearly 2,000 kilometers every summer for the past two decades, students from Fudan University in Shanghai come to work as volunteer teachers at Sanhe Middle School in Xihaigu, Ningxia Hui autonomous region.

In this documentary series, the principal and the volunteers tell their story.

Episode 1

The 7th teaching building

On the campus of Fudan University in Shanghai, there are six teaching buildings. But there's a seventh one about 2,000 kilometers away — Sanhe Middle School in Xihaigu, Ningxia Hui autonomous region.

Wu Heng, a volunteer teacher at Sanhe, reached out on the internet and gathered funds to buy every student two dictionaries.

"When they encounter words they don't recognize, they can ask a teacher or consult a dictionary," Wu said. "Teachers might be away, but dictionaries will always be around."

Video by Yinchuan Jufen Creativity