I just wanted to show you this last graph, or this last set of statistics to go from causes of death in the U. S.

我想让你们看的最后一张图,或者说最后一组统计数据,不是关于美国人的死因

耶鲁公开课 - 生物医学工程探索课程节选

Well, a cross-sectional study would mean that you'd get a random group of the population and measure them in 1970 and then take another random group five years later and measure them, but it wouldn't be the same people necessarily, it would be different groups of people.

那么,横断面研究就是,1970年你在人群中随意选择一组人,并记录下相关数据,然后,五年后再随意选择一组人记录数据,但这不需要是同一组人,通常是不同的人

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选