湖北省武汉市的张萌小朋友问:风筝为什么能在天上飞?春天是放风筝的好季节,在风和日丽的天气里,到野外去放风筝,是件惬意的事。当仰头看着翱翔在天空的风筝时,你也许会问,风筝没有翅膀,为什么能飞上天呢?如果你仔细观察就会发现,风筝上升时大都是倾斜的,风从前方吹过来,气流吹 Zhang Meng, Wuhan, Hubei Province Children ask: Why kites fly in the sky? Spring is a good season to fly a kite, in the sunny weather, go to the wild to fly a kite, is a pleasant thing. When looking up at a kite flying in the sky, you may ask: Why do you fly a kite without wings? If you look closely, you will find that when the kite rises, it is mostly inclined. The wind blows from the front and the airflow blow