"People realize, you know, they are not only going to have to be mobile out of a choice, but they are going to have to be mobile because of necessity."

VOA: special.2011.07.21

They were always mobile, always going somewhere, always changing.

他们总是流动的,总有新的目的地,总是不断变化着的

耶鲁公开课 - 美国内战与重建课程节选