在英国的剑桥大学里有一条清澈美丽的河流,叫做剑河。剑河上就住着很多天鹅。阳光灿烂的星期天,剑河上的天鹅游到岸边在抢吃面包。天鹅是一种美丽的冬候鸟。它们喜欢成群栖息在湖泊和沼泽地带,主要以水生植物为食物,所以也可以称它们为“水鸟”。天鹅在类别上属鸟纲, In the United Kingdom, Cambridge University has a clear and beautiful river, called the Jianhe. There are many swans on the river of the sword. Sunny Sunday, the Swan on the Sword River to grab the bread in the shore. Swan is a beautiful winter bird. They like to inhabit the lakes and swamps in groups, mainly aquatic plants for food, so they can also be called “waterbirds.” Swan in the category is a bird class,