“最是西风消息早,一叶阶前。”寥寥二句就描绘出秋天的景象。西风、落叶几乎成了秋天的象征。为什么秋天会落叶呢? 众所周知,树叶有很多种,它们形态各异,有的像针,有的似眉,有的却大如蒲扇,但它们有一个共同点:均由叶片、叶柄和托叶三部分组成。当然,有的叶子 “The most important thing is that the west winds are early and one leaf is ahead.” The two sentences describe the autumn scene. West wind and fallen leaves are almost symbols of autumn. Why do fall leaves fall? As we all know, there are many kinds of leaves, they have different shapes, some like needles, some like eyebrows, and some are as big as the fan, but they have one thing in common: all by the leaves, petiole and stipules Three parts. Of course, there are some leaves