Contestants of Northeastern University position a robot during the Robocon Finals of the 16th China University Robot Competition in Zoucheng City, east China's Shandong Province, June 11, 2017. Team of Northeastern University took the first prize of the contest. (Xinhua/Xu Suhui)
Contestants of Northeastern University pose for a group photo after they win the contest during the Robocon Finals of the 16th China University Robot Competition in Zoucheng City, east China's Shandong Province, June 11, 2017. Team of Northeastern University took the first prize of the contest. (Xinhua/Xu Suhui)
High school students visit a historical site in Hejian City, north China's Hebei Province, June 10, 2017. China celebrated its first Cultural and Natural Heritage Day on Saturday. (Xinhua/Zhu Xudong)
A harvester collects wheat in Nanpi County, north China's Hebei Province, June 11, 2017. More than 70 percent of summer wheat have been harvested across the country. (Xinhua/Mu Yu)
A farmer arranges harvested wheat in Nanpi County, north China's Hebei Province, June 11, 2017. More than 70 percent of summer wheat have been harvested across the country. (Xinhua/Mu Yu)