Some, like the smallpox vaccine on one exposure generates a very high response that lasts for many years so you don't need a boost.

有一些疫苗,比如接触一次天花疫苗后,人体就能产生高水平的免疫应答,并持续很多年,所以无需再次接种

耶鲁公开课 - 生物医学工程探索课程节选

One is there's no lag period, notice that antibody levels start rising right away after the second exposure.

第一是没有迟滞期,请注意,抗体浓度迅速上升,在第二次接触抗原时

耶鲁公开课 - 生物医学工程探索课程节选

Barth wrote a famous essay just the year before these stories came out all in one volume. They had been written over a series of years, got a lot of exposure--called "The Literature of Exhaustion."

在写完这一卷故事的前一年,巴斯写了一篇著名的论文，在60年代，叫《枯竭的文学》

耶鲁公开课 - 1945年后的美国小说课程节选

One thing I do want you to remember is that IgM class antibodies are the antibodies produced on first exposure.

我希望你们记住的一点是,IgM类抗体是人体在,第一次接触抗原时产生

耶鲁公开课 - 生物医学工程探索课程节选