Passage Three [br] How do traditional vaccines work?To provoke immune systems wi

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问题 Passage Three [br] How do traditional vaccines work?

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答案 To provoke immune systems with dead or weakened live viruses.

解析原文最后一段对传统疫苗和新型疫苗进行对比描述，传统疫苗使用死亡的或弱化的病毒来激发免疫系统，故答案为“To provoke immune systems with dead or weakened live viruses.”。

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