So, every time you're exposed to a new vaccine or a new antigen you go through this primary response before you have the secondary response.
所以,每当你接触到新疫苗或是新抗原,在再次免疫之前,机体将会经历这样的初次免疫过程
耶鲁公开课 - 生物医学工程探索课程节选
And that's a new approach to producing vaccines.
这就是制造疫苗的新方法
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