Students pose for photos on their visit to a coal museum, which is located underground at the Jinhuagong National Mine Park in Datong City, north China's Shanxi Province, May 16, 2017. (Xinhua/Cao Yang)
Aesthetic Group Gymnastics World Championships held in Finland
Dragon boat competition held in east China's Anhui
Aerobatics aircraft perform at air show in C China's Henan
Oslo Medieval Festival marked in Norway
10th Int'l Antiques Fair held in Hong Kong
Systematic excavation of dinosaur fossils launched in NE China
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