来自《耶鲁大学开放课程：生物医学工程探索 第10集 第10集》
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Well, this is an approach这种方式 -
that's been used in a variety of vaccines,已经为许多种疫苗使用 -
most successfully with Hepatitis B,乙型肝炎疫苗是最成功的 -
so the problem is where do you get these proteins?但问题是该从哪里获得这些蛋白质呢 -
Well, one way to get proteins,获得蛋白质的方法之一 -
and it was first used in Hepatitis B,也是首次用于制造乙型肝炎疫苗的方法 -
is to find patients,就是寻找患者 -
find individuals who are already infected with Hepatitis B.寻找到一些已经感染乙肝的患者 -
So, Hepatitis is already infecting cells of their liver,乙肝病毒已经感染了他们的肝细胞 -
their liver is actively making new virus.他们的肝脏正在迅速地产生新的病毒 -
It turns out in the case of Hepatitis B,结果显示 在乙肝的病案中 -
the way the lifecycle proceeds--病毒生命周期的发展情况