His Leatherstocking Tales are full of a certain anxiety about what might be happening to that frontier, what's coming from east to west.

他的《皮袜子故事集》里弥漫着某种焦虑不安,它讲述了西进运动开拓者们从东部来到西部,有可能会遇到的一些事情

耶鲁公开课 - 美国内战与重建课程节选

Just a word about the leading colonizers, because I think there's something to be learned from that.

让我用一句话评论这些殖民的开拓者,我认为在他们身上有值得我们学习的东西

耶鲁公开课 - 古希腊历史简介课程节选