International students from International Exchange College in Inner Mongolia Normal University (IMNU) show off their work on March 28. The university organized classes for international students to learn movable-type printing, one of the world's oldest printing methods. The printing system was invented by Bi Sheng in China during the Northern Song Dynasty (960-1127). [Photo/imnu.edu.cn]

Students learn about movable-type printing at a print workshop in the Yuquan district of Hohhot, capital of north China's Inner Mongolia autonomous region, March 28. [Photo/imnu.edu.cn]