英语作文as we know, trees are very useful on the ear

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1A tree has three main parts, the roots, the branches and the leaves. Under the ground, the roots spread out so that the tree can stand firm. Above the ground, the roots form the trunk, and the trunk supports the branches. Near the top of the tree, the trunk divides into branches. At the top of the tree, the leaves grow out of the branches. The leaves receive sunlight to help the whole tree grow.
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We know that trees are useful in our everyday life. They give us many things, such as wood, oxygen, rubber, medicines and many other things. They can also tell us a lot about our climate. The following are the reasons. If'you, cut down a tree, you can see that it has many rings (年轮). Most trees grow one new ring every year. Because of this reason, we know how old a tree is. A tree over a hundred years old means that it has more than a hundred rings . When the climate is dry or very cold, the trees do not grow very much and their rings are usually thin . When it is wet and warm, the rings are much thicker. If the rings are suddenly very thin or suddenly very thick, this means that the climate changed suddenly. If we Iook at the rings on this tree, we can learn about the climate for a hundred years. We can see how 0ur climate is changing today.