5. Smiling Boosts Your Immune System
Smiling helps the immune system to work better. When yousmile, immune function improves possibly because you are morerelaxed. Prevent the flu and colds by smiling。
5.微笑增强免疫力
微笑可以让免疫系统更好的工作。当你微笑,免疫功能可能会因你的放松而增强。微笑可以预防流感和伤风