小朋友们,你们仔细观察过秋天的落叶吗?这可是很有意思的哦。植物的落叶大多数是叶背朝上,叶面朝下,这并不是秋风玩的把戏,而是由叶子的内部特殊结构造成的。大多数植物的叶子,叶背和叶面在植物生长的过程中所接触到的 Children, have you observed the autumn leaves carefully? This is very interesting. Most of the plant leaves are leaves back up, leaves down, this is not the trick to play the autumn wind, but by the leaves of the internal special structure caused. Most plants have leaves, leaves and foliage that come into contact with the plants during their growth