大千世界奥秘无穷,有很多我们不知道的科学知识。有一天,爸爸问我:“鸟的羽毛是干什么用的?”我说:“不知道。”爸爸说,不知道就要去学。我就在《我们爱科学》这本书上找有关鸟的知识。大家想知道答案吗?鸟的羽毛有什么作用?鸟类的身体外面覆盖着的羽毛,不仅具有保温的作用,而且使鸟类的外形呈流线型。流线型在空气中受到的阻力小,有利于飞翔。飞行时,鸟的两只 There are so many mysteries in the world that there is a lot of scientific knowledge that we do not know. One day, my father asked me: “What is the use of the bird’s feather?” “I said:” I do not know. “” Father said, I do not know. I will find out about birds in the book “We love science.” We want to know the answer? What is the role of the bird’s feathers? The bird’s body covered with feathers, not only has the role of insulation, but also to streamline the shape of birds. Streamlined in the air by the resistance is small, is conducive to flying. Two birds when flying