Q妈妈,鸟儿为什么能在天上飞?因为鸟儿有翅膀呀!你看,鸟儿的翅膀如果伸展开来,比它的身体要长得多呢!同时,鸟儿的骨骼很轻,长骨内有空气。它还会随时随地排便,这不是因为它不爱干净,而是为了尽可能地减轻自己的体重,只有身体轻才飞得起来、飞得高。还有很重要的一点是,鸟儿的羽毛很特别,又轻又软,覆盖在鸟的全身,不仅能保暖,还能使它飞行。 Q. Why can birds fly in the sky? Because the birds have wings! Look, if the wings of a bird stretch out, it is much longer than its body! At the same time, the birds’ bones are light and the long bones There is air inside. It will also defecate anytime, anywhere, not because it does not love clean, but in order to reduce their weight as much as possible, only the body of the light to fly and fly high. It is also important to note that the bird’s feathers are special, light and soft, covering the whole body of the bird, not only to keep warm but also to fly it.