But that's the sort of the thing we do and it's coupon clipping and it's risk mitigation or risk elimination--fairly short.

但这似乎就是我们正在做的事情,那就是定期得到收益,同时也是风险弱化或者风险消除-的确很短。

耶鲁公开课 - 金融市场课程节选

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

This was not a naturally occurring attenuated virus as used in smallpox, but a virus that was attenuated in the laboratory, basically by propagating it in culture and looking for mutants that were formed as you propagated this virus under different experimental conditions.

这不是在制造天花疫苗时,使用的那种天然减毒病毒,而是一种在实验室中被人工弱化的病毒,基本上是通过在细胞中培养繁殖后,从这些培养出来的病毒中挑选出,不同实验环境下的变异体

耶鲁公开课 - 生物医学工程探索课程节选