People always say that smile is the most beautiful person card. I strongly agree with them. Smile likes the sunshine that can bring warmth to people and make people happy. When you are happy, you will smile subconsciously, because a good mood brings smile to your face. But, you also should smile when you are upset, because smile might bring you confidence, courage so that cheer yourself up.
Smiling shows good mood and positive attitude to life, so that those people who always smile can attract the others easily, because people like to build relationship with smiling ones. Moreover, smiling shows sincereness and confidence. No matter to yourself or others, they both important. Besides, when you smile to the world, the world is smiling at you. Therefore, keep smiling and show you best to the world.