Why Do Leaves Change Color

Why Do Leaves Change Color？

为什么叶子会变色

Look at the leaves! 1t's autumn, and leaves are turning red and yellow,gold and brown. Each type of tree has its own kind of leaves. The colors of autumn leaves differ from tree to tree. Some oak leaves may be brown or yellow,while maple leaves may turn bright red.

秋天来了!看看那些叶子,纷纷变成了红色、黄色、棕色或者金色。每种树的叶子都不-样 ,到了秋天 ,树叶的颜色也不一样。像树叶会变成棕色或黄色,枫树叶则会变成鲜红色。

Leaves come in different sizes and shapes as well as colors. Some leaves are wide, and others narrow, Some have points, while others may be rounded. How many different kinds can you find?

不仅颜色不同,叶子的大小和形状也不同,有的宽,有的窄,有的尖,有的圆。看一看你能找出多少种叶子?

Just a few weeks ago, all the leaves were green. Back in the spring, the tiny new leaves uncurled from their buds. The green color in the leaves helps them to absorb or hold sunlight.Chlorophyll gives the leaves their green coloring. Chlorophyll is a natural coloring called a pigment.

几个星期前,所有叶子都还是绿的。再往前回到春天,新生的小绿叶才刚从叶芽里舒展开来。叶子里的绿色能帮助它们吸收或接受阳光。叶绿素是一种天然色素,使叶子呈现出绿色。

Leaves are very important to the tree. They make a kind of sugar that is the tree's food. Leaves need sunlight, water, and air to make this food. The leaves work to feed the tree all summer long. The sugar is used by all parts of the tree-the leaves, branches, trunk, and roots. The food, or sugar, helps the tree to grow, Extra sugar is stored in the leaves.

叶子对树来说非常重要 ,它们能制造树木生长所需的糖分。叶子需要阳光、水分和空气才能制造这种糖分。整个夏天，叶子一直在努力给树提供糖分。树的各个部位都需要糖分包括树叶、树枝、树干和树根。叶子生产的糖分会帮助这棵树继续长大,多余的部分则储存在叶子里。

In the fall, many things are changing. In many places, there is a change in the weather. There are changes in light and temperature. Inside the leaves, there will be many changes too. All of these changes bring about the beautiful colors of fall. In the fall, there are fewer hours of sunlight each day. The change in light tells the tree to get ready for winter. Winter is a time of rest for the tree.When winter comes, the tree will have to survive with less water and sunlight.

到了秋天,自然界会发生许多变化。很多地方的天气变了，日照量和气温变了，叶子里面也会发生很多变化。这些变化带来了属于秋天的美丽色彩。秋天，光照时间变短，光的变化在告诉树木该准备过冬了。冬天是树木的休息时间,这个时候它们只靠着少量的水分和阳光存活。