从试验中我们得知笑声和欢乐会增强免疫功能，尤其可以生产帮助保护身体免受疾病和癌症侵害的天然杀伤细胞。
We know from research that laughter and joy boost immune functions, especially the production of the natural killer cells that help protect the body from illness and cancer.
早在上世纪九十年代，伯克博士就发现笑会增加癌症病人天然杀伤细胞(也叫抗癌细胞)的数目，天然杀伤细胞是身体对抗肿瘤的办法。
In the mid-1990s, Dr Berk found that laughter increases the number of natural killer cells in cancer patients. Natural killer cells are the body's way of fighting tumours.
自然杀伤（NK）细胞是天然细胞免疫系统的重要组成部分，是防御病毒感染的第一道防线。
Natural killer (NK) cells are an important component of the innate cellular immune system which provide a first line of defence against viral infections.
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