求翻译：从1948年起世界精神卫生组织将每年的5月8日确定为世界微笑日，是唯一一个庆祝人类行为表情的节日，在对别人的微笑中，你也会看到世界对你微笑起来。经调查研究，皱一下眉头需要牵动20块肌肉，而笑一笑只需要牵动13块肌肉，由此可见，笑一笑可以延缓衰老，同时，也给人一整天的愉悦心情。发自内心的微笑，能够改善人的情绪，减轻压力，增强免疫力。是什么意思？

Since 1948, World Mental Health Organization will on May 8 annual World Smile Day, is the only festival, a celebration of the expression of human behavior in the smile of others, you will see the world smile on you. Research, wrinkled brow affects 20 muscles, smile affects 13 muscles, we can see tha

Since 1948, the world's mental health organizations in each of the 5 on 8, for the world smile Day, a 11 is the only celebration of human behavior, facial expressions of the holiday to others in the smile, you will see the world smile. The study, a wrinkled forehead muscles need to be pulled 20, and

From 1948 the world mental hygiene organization every year on May 8 determined for the world smile date, will be only one celebrates the human behavior expression holiday, in to others smile in, you also could see the world smiled to you.After the investigation and study, wrinkles the brow to need t

Since 1948, the world spirit who May 8 world smile day in each year, and is the only Festival a celebration of human facial expressions, smile to others, you will also see the world smiling at you. Upon investigation, wrinkle the brow needs affecting 20 muscles, and smiled only affects 13 muscles, i