It's important to learn how we can protect the environment . Here are 5R rules for us . Reduce( 减少 ) . If you want to reduce waste, you should use things more cleverly . A large number of trees are being cut down to make paper . If everyone uses paper carelessly, soon we would not have any trees left . Other things are also being wasted, and people don't know what to do with the waste in big cities . So it is necessary to reduce the amount( 数量 )of waste we produce . Reuse . You should always think of reusing things before throwing them out . For example, give the clothes you do not use or the ones that are too small to the poor . In a family, you may pass on such clothes to younger brothers or sisters . Recycle . Bottles, cans and paper can easily be recycled . By doing so we save lots of time and money . For example, coke cans are sent to a factory, where they are smashed flat and melted . The metal can be used to make new coke cans . Recover . When you buy a box of apples, there may be a few rotten( 腐烂的 )ones . You have two choices : one is to throw the apples away; the second is to throw the rotten ones and keep the good ones . In this way, you are recovering the eatable parts of food . Repair . If one of the legs of your table is broken, you should repair it . If you want to buy something newer and better, it is better for you to sell the old thing, or give it to people who can use it after repairing it . Learn the rules to protect our environment . Let's try our best to make the earth cleaner and more beautiful .