
Children watch a medieval-style swords during the Oslo Medieval Festival at Akershus Fortress in Oslo, capital of Norway, on May 27, 2017. (Xinhua/Liang Youchang)

Children watch a medieval-style swords during the Oslo Medieval Festival at Akershus Fortress in Oslo, capital of Norway, on May 27, 2017. (Xinhua/Liang Youchang)