It was the romantic--and by the way, about 3,300 miles of such canals would be built by the middle of the 1850s, all for the purpose of commerce, and to move people.

顺便说下,这是多么浪漫的事,在五十年代中期,为了商业运输和劳力流通,而建造的这类运河总长达3300英里

耶鲁公开课 - 美国内战与重建课程节选