要想找出原因，唯一的方案就是进行随机实验，让人们住进不同的社区，并在几年内坚持跟踪他们的健康状况。
The only way to sort out cause and effect is to do a randomized trial, moving people around between neighborhoods and tracking their health over several years.
科学家随机抽取了10317名大学生作为研究对象，并跟踪调查了他们从1957年毕业后到现在的情况。
Scientists studied a random group of 10,317 college students from their graduation in 1957 until the present day.
科学家随机抽取了10317名大学生作为研究对象，并跟踪调查了他们从1957年毕业后到现在的情况。
Scientists studied a random group of 10, 317 college students from their graduation in 1957 until the present day.
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