The graph is something I showed you on the first day of class, that over the last hundred years in particular, but what's shown on this slide is over the last 300 years.

第一节课我就给你们展示过这幅图,该图特别地关注了近一百年的情况,但它涵盖了过去三百多年的历史

耶鲁公开课 - 生物医学工程探索课程节选