网上找的一篇，仅供参考：

No body language can be more attractive than smiling. Not only can a beautiful smile make ourselves happy, but also it enables others to feel delighted. Sometimes when a smile is so powerful that it gives people suffering from disasters great courage.

A little boy named Lang Zheng, for instance, impressed and encouraged a great many people when a serious earthquake happened in Wen Chuan. Right after he was rescued by the soldiers from the ruins, he saluted and smiled to them. His smile was like sunshine which warmed people who were in sadness.

It is safe to say that without smile our life would be colorless and difficult. It is suggested that we smile as much as possible.