Why Do Leaves Change Color

Why do leaves change color? Written by Keira Fried.

树叶为什么会变颜色呀？ 作者：凯拉·弗里德

So many colors. Why are leaves on trees different colors? What makes them change color?

好多好多颜色呀。 为什么树上的树叶颜色都不一样呢？ 是什么让它们变颜色的呀？

Making food. Leaves make food for the tree from sunlight, water, and air. Green stuff in the leaves helps them make food. It also makes the leaves green.

制造养分。 树叶会利用阳光、水和空气为大树制造养分。 树叶里的绿色物质帮助它们制造养分， 也让树叶变成了绿色。

Summer. Leaves are green in summer because they are making food. The tree saves some of the food for winter.

夏天。 夏天的树叶是绿色的，因为它们一直在制造养分。 大树会把一部分养分存起来留到冬天用。

Fall. In fall, the weather changes. The days get shorter and the nights get longer. Trees get less sunlight, so they make less food.

秋天。 秋天到了，天气发生变化。 白天越来越短，夜晚越来越长。 大树能接收到的阳光变少了，所以制造的养分也变少了。

the leaves stop making the green color. Other colors that were under the green start to show.

树叶就不再产生绿色的物质了。 原本藏在绿色底下的其他颜色就开始显现出来啦。