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.微笑增強免疫力
微笑可以讓免疫系統更好的工作。當你微笑,免疫功能可能會因你的放松而增強。微笑可以預防流感和傷風