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
so they can see different cultures, different type of things that they have there.
他们(孩子们)就能在那里接触不同的文化,做不同的事情。
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