As those doses were given you look at the prevalence of polio within the United States.

随着疫苗的使用,你可以看到全美小儿麻痹症

耶鲁公开课 - 生物医学工程探索课程节选

Two is it gives you some sense for how concerned parents were about the risks of polio in the community and how much they wanted a vaccine to be developed, such that they gave permission for their children to enter into this trial.

第二是,它能让你了解,父母们对孩子,罹患小儿麻痹症的风险的关心程度,以及对疫苗的渴望程度,这使得他们同意让他们的孩子,参与到这种实验中

耶鲁公开课 - 生物医学工程探索课程节选