We know from research that laughter and joy boost immune functions, especially the production of the naturalkillercells that help protect the body from illness and cancer.
研究表明笑声和快乐会提高你的身体免疫力，特别是它们会产生的自然杀伤细胞能使你免受疾病和癌症的侵害。
2
Naturalkillercells, which are a class of lymphocyte distinct from t cells and B cells, destroy foreign cells (eg, neoplastic cells) even without prior sensitization.
自然杀伤细胞是一类与T细胞和B细胞不同的淋巴细胞，可在未被致敏的情况下破坏外来细胞(如肿瘤细胞)。
3
The genes in question control a type of white blood cell known as naturalkillercells, or NK cells.