That economy and that society go forward and flourish for, as I say, about 400 years maybe--perhaps about 400 years.

这种经济和社会,发展繁荣了,大概四百年,也许四百年

耶鲁公开课 - 古希腊历史简介课程节选

The northern states by the Antebellum Period 1820s,1830s,1840s-- was beginning to sort of hurtle toward a different future than what that slave society was perhaps--no, not really slowly it too was hurtling toward a certain future.

北方在战前,也就是19世纪20至40年代,就急速开始朝着,和奴隶社会完全不同的方向发展,但是南方奴隶社会的发展得也不是很慢,它也在飞驰向一个确定的未来

耶鲁公开课 - 美国内战与重建课程节选