And I talked about eradicating smallpox in 1977, right when officially the last case was reported, and it was certified to be eradicated shortly after that.

我刚刚已经讲了一九七七年根除天花,当时发布了最后一例官方报告,自此之后,天花已经确认根除

耶鲁公开课 - 生物医学工程探索课程节选