Now traditional Chinese medicine to improve one's immunity has become a fast-selling product. 现在增强免疫力的中药成了抢手货。
Fighting against wrong ideas is like being vaccinated -- a man develops greater immunity from disease as a result of vaccination. 同错误思想作斗争，好比种牛痘，经过了牛痘疫苗的作用，人身上就增强免疫力。
