A flock of tundra swans fly over the Liaohekou National Nature Reserve, northeast China's Liaoning Province, March 19, 2017. The reserve is the rest place where the birds migrate to the north. (Xinhua/Pan Yulong)
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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