Strong trees Long ago, Trees are very strong. The reason is as follows, First of all, they can help to fresh the air. Second they can make surroundings more beautiful. Third trees can provide us much wood to build houses. Fourth trees can provide us shade to protect us from the strong sunlight. Now, due to the destruction of human beings, trees become no longer strong. Trees are important for us and we should protect them to make the trees strong. 本文来源：https://www.wddqw.com/doc/89cbc9f09dc3d5bbfd0a79563c1ec5da51e2d655.html