As the saying goes ,"A mere smile makes you ten years younger". People who like smiling and often smile not only leave a friendly impression on others, but also change their own mood. As a result, faced  with great pressure from our work, study and family, I hold the view that we should smile a hearty smile. A few days ago, while chatting with one of my friends on the Internet, I poured out all my annoyance to him. After learning this, he sent me his picture with a big smile, which changed my bad mood greatly immediately.  From the above example, we may know that if we smile to our life, our life can give us a big