Dragon boats sail in the canel of Aveiro, Portugal, on June 16, 2018. A dragon boat sailing event, jointly organized by the Confucius Institute at Aveiro University and the municipality of Aveiro, was held here on Sunday, to greet the upcoming Chinese Dragon Boat Festival. (Xinhua/Zhang Liyun)

Students present egg bags during the opening ceremony of a dragon boat sailing event in Aveiro, Portugal, on June 16, 2018. A dragon boat sailing event, jointly organized by the Confucius Institute at Aveiro University and the municipality of Aveiro, was held here on Sunday, to greet the upcoming Chinese Dragon Boat Festival. (Xinhua/Zhang Liyun)

Dragon boats sail in the canel of Aveiro, Portugal, on June 16, 2018. A dragon boat sailing event, jointly organized by the Confucius Institute at Aveiro University and the municipality of Aveiro, was held here on Sunday, to greet the upcoming Chinese Dragon Boat Festival. (Xinhua/Zhang Liyun)

A dragon boat sails in the canel of Aveiro, Portugal, on June 16, 2018. A dragon boat sailing event, jointly organized by the Confucius Institute at Aveiro University and the municipality of Aveiro, was held here on Sunday, to greet the upcoming Chinese Dragon Boat Festival. (Xinhua/Zhang Liyun)

Students of Confucius Institute at Aveiro University perform bamboo pole dance during the opening ceremony of a dragon boat sailing event in Aveiro, Portugal, on June 16, 2018. A dragon boat sailing event, jointly organized by the Confucius Institute at Aveiro University and the municipality of Aveiro, was held here on Sunday, to greet the upcoming Chinese Dragon Boat Festival. (Xinhua/Zhang Liyun)