Remember back to Alexander H. Steven's cornerstone quote he uses the word "Natural" Twice in that passage.

还记得亚历山大·斯蒂文的柱石上的引文,这段引文中他用了"自然"这个概念两次

耶鲁公开课 - 美国内战与重建课程节选

I was coming back to New Haven on the train afterwards and I came across this quote.

后来有一次我在坐火车回纽黑文的路上,无意中翻到这么一段话

耶鲁公开课 - 金融市场课程节选