You can have genes related to the immune system .

你身上有与免疫系统相关的基因。

Your immune system is affected .

你的免疫系统受到影响。

Laugh to strengthen your immune system .

微笑能增强你的免疫系统。

Vitamin c helps boost the immune system .

维生素c可帮助激发免疫系统。

Mhc genes affect important immune responses .

该基因会影响重要的免疫反应。