When you experience joy, fear or relaxation, the immune system will increase or decrease the growth of disease-fighting cells, and help you to fight off the flu, or even cancer.

• 当你兴奋、恐惧或者轻松时，免疫系统会增加或减少抵抗疾病的细胞的生成，从而帮助你抵抗流感，甚至癌症。