As we all know, trees have many uses in our daily life. We can make wood into desks, chairs and paper. We also can use wood to build houses. Trees can not only make the air clean，but also make oxygen. What’s more, trees can prevent water from washing the earth away . In a word, trees are important to humans. So we must plant more trees and prevent people cutting down too many trees . We’d better not use paper cups which can be used only once.
众所周知,树木在人们的生活中起着非常重要的作用,请根据下面的提示写一篇80词左右的英语短文。