But you can grow it in cultured cells, and the advantages of that are that you can do this under very reproducible conditions.

而且采用细胞培养疫苗,这种方法的优点是,你可以在同样条件下进行再培养

耶鲁公开课 - 生物医学工程探索课程节选

So, how could you produce--the question is, how could you produce large quantities of this- of this microorganism, this virus vaccinia under controlled conditions?

问题是该怎么进行生产,你怎么大批量生产这种微生物,即在可控条件下生产牛痘病毒

耶鲁公开课 - 生物医学工程探索课程节选