any of several sea birds of the genera Fratercula and Lunda of northern regions,characteristically having black and white plumage and a vertically flattened,triangular bill that is brightly colored during breeding season是什么意思_any of several sea birds of the genera Fratercula and Lunda of northern regions,characteristically having black and white plumage and a vertically flattened,triangular bill that is brightly colored during breeding season在线翻译_英语_读音_用法_例句