PASSAGE THREE [br] How do the traditional vaccines work?To provoke an immune sys

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问题 PASSAGE THREE [br] How do the traditional vaccines work?

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答案 To provoke an immune system．

解析原文最后一段对传统疫苗和新型疫苗进行对比描述，传统疫苗运用已经死亡或濒临死亡的病毒来培养人体免疫系统。故答案为“To provoke an immune system．”。

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