以“树是我们的好朋友”为题，写一封至少有60个单词的信给所有的市民。 Dear citizens, We are a group of students in a middle school. We find that many trees in our city have been damaged. Trees are our good friends. They clean the air and bring us enough oxygen. They help keep the balance of nature. The green leaves and the different gestures of the trees add beauty to our city. With trees,many birds come to our city. They make our life vivid and interesting. We should protect the trees. Now we are calling:Don't hurt our friends一trees. A group of students 注释: 1) Many trees have been damaged.许多树受到伤害. 2) keep the balance of nature保持生态平衡 3) add beauty to our city给城市增添了美丽 本文来源：https://www.wddqw.com/doc/11ca9fcc1ae8b8f67c1cfad6195f312b3169eb22.html