秋天，叶子为什么会变颜色
In autumn, many trees put on a show. Green leaves turn yellow, orange, and red. Then they fall to the ground. Why does this happen?
秋天，许多树都上演一场表演。绿叶变成黄色、橙色和红色，然后飘落到地上。这是为什么呢？
Leaves are green because of a stuff called chlorophyll. It helps the tree make food from sunlight. In summer, there is a lot of it.
叶子是绿色的，是因为一种叫叶绿素的东西。它帮助树木利用阳光制造养分。夏天，叶子里有很多叶绿素。
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