There's a group of people in the United States and elsewhere who studied something called the Built Environment- how the environment is built affects how much physical activity we get.

在美国以及其他地区有这样一群人,进行着被称为环境构建的研究,研究环境的构建是怎样影响我们的活动量

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

So, you have to imagine that this thing started with these guys back in their camp and the other army back in its camp, and they both have to agree that they want to have a battle, for a battle to take place, and they will have picked a place that is flat where they can do what they're doing.

所以事情是这样的,你得想象一下,一群人各属于不同阵营,他们都同意开战,为了进行战斗,他们需要挑选一块平地,以供双方的方阵摆开架势

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