It's post-Christian in the sense that it's hard to live in America without having some kind of exposure to Christianity and without seeing its influence on our society,on our politics, on our culture and our art,and that sort of thing.

一方面，生活在后基督教的美国不可能,不接触到基督教文化,不可能忽视它对社会，政治，文化，艺术等方面的影响。

耶鲁公开课 - 新约课程节选

You could probably find some antigens that don't follow exactly this behavior, but in general, this is the kind of behavior you would see on first exposure to an antigen or vaccine, called the primary exposure, and on subsequent exposure to an antigen or vaccine called the boost.

可能你也会发现,一些抗原并不完全遵循这种模式,但通常来说,在你首次接触一种抗原或疫苗时,都能观察到这种模式,它被称为初次免疫,而接下来的,再次接触抗原或是疫苗被称为增强免疫

耶鲁公开课 - 生物医学工程探索课程节选

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

On second exposure it's different, that IgG is produced predominantly on second exposure to an antigen.

而再次免疫则不同,再次接触相同的病原体时,人体主要产生的则是IgG

耶鲁公开课 - 生物医学工程探索课程节选