A smile shows that a person is happy. For example, a person may smile when he or she is p with some progress in studies. Or a person may smile if a friend tells a funny joke. There are other good r to smile often.
First, it is e to smile than to show unhappiness. In fact, it only takes 17 muscles (肌肉) to smile. On the other hand, it takes 43 muscles to show unhappiness. So give the muscles in your f a rest and smile!
Second, smiles are nice. People may try to l nice by exercising or wearing nice clothes. However, people often say a smile is the best thing a person can wear. That is because it is easy to be a someone who is smiling and happy. Almost no one wants to stay with someone who is always unhappy.
Third, smiles have power (感染力). Both smiling and laughing can easily and quickly s from one person to another. If one person smiles, people around him or her want to smile, too. Similarly, when a person laughs, people tend (往往会) to laugh with him or her. If a person is s, the best thing to do is to share a smile or a laugh. It is the easiest way to cheer someone up.
F, smiling and laughing are very good for the body. Even though you are sad, try smiling. You'll find that it will be difficult to s sad for very long!
