And so this is an example of a naturally occurring, attenuated vaccine.

这就是一个天然减毒疫苗的例子

耶鲁公开课 - 生物医学工程探索课程节选

So, that was a naturally occurring attenuated virus that could be produced into a vaccine that didn't cause the disease.

因为天花病毒存在天然的衰减病毒,这种衰减病毒可以用来,直接生产不致病的疫苗

耶鲁公开课 - 生物医学工程探索课程节选

We've talked about getting lucky, finding a naturally occurring attenuated live vaccine as in the case of smallpox.

我们谈到过,在天花病案中,我们发现自然弱化的活性疫苗,是多么的幸运

耶鲁公开课 - 生物医学工程探索课程节选

Remember that the lucky thing about the smallpox vaccine was that a naturally occurring attenuated form of the smallpox virus variola called vaccinea was found.

对于天花病毒来说,幸运的是,存在一种自然发生的,被称作痘苗病毒的,天花病毒的衰减疫苗

耶鲁公开课 - 生物医学工程探索课程节选

He produced an oral polio vaccine from an attenuated virus.

他利用减毒病毒制得口服小儿麻痹症疫苗

耶鲁公开课 - 生物医学工程探索课程节选