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

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And so because of those two things you could think about eradicating the virus.

基于天花的这两个特性,有关人员就能想出根除天花的方法

耶鲁公开课 - 生物医学工程探索课程节选