其原因也许在于童年时期感染幽门螺旋杆菌能让免疫系统学会适当地反击外源抗原，这样长大后就不会因为反应过激而出现哮喘。
It could be that encountering Helicobacter as a kid teaches the immune system how to react, and not overreact as in asthma to future allergens.
这些年来我自下意识地采取一些措施切断毒源。例如，不让我的孩子进行免疫接种，因为疫苗药液里含有汞。
I've made some perceived radical decisions over the years such as not immunizing my children due to the mercury content in the immunization fluid given to babies.
你也许会这样想，一个混合的免疫系统应当更加活跃而不是受抑制，所以它应当会攻击受捐献者的其他器官，因为其他器官在被移植的免疫细胞看来应当是外源的。
You would think that a chimeric immune system would be more active, not less, and would therefore attack the recipient's other organs, since they look foreign to the transplanted immune cells.
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