Industry representatives Director Josh Fox has documented the environmental effects of new drilling methods, including flammable tap water, across 24 states in his new film "Gasland."

VOA: standard.2010.01.02

This refers to the fact that people- this sounds like something you probably already know but it has been documented by psychologists.

指的是人们...,照字面意思,可能你们已经猜到,心理学家已经证明了这一原理

耶鲁公开课 - 金融市场课程节选

For example, people tend to believe that their team will win; this has been documented by psychologists.

比如,人们倾向于相信他们支持的球队会赢,心理学家已经证明了这点

耶鲁公开课 - 金融市场课程节选