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为什么剔除了毒性的病毒(疫苗)可以激发人体免疫能力达到对该种病毒免疫,而该病毒首次入侵人体时,免疫系统却无能为力?

zqssss (super)
(#11070510@0)
2017-9-25 -04:00
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