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

Alexander H. Stephens, a Georgian, a slaveholder, said the cornerstone of the Confederacy, the cornerstone of their political movement, was what he called "American Negro slavery."

亚历山大· H·斯蒂芬斯,一个来自乔治亚州的奴隶主,用他的演讲为邦联打下了基石,这块邦联政治运动的基石,被他称为,"美国的黑人奴隶制度"

耶鲁公开课 - 美国内战与重建课程节选

And I use the term photon here, and that's because he also concluded that light must be made up of these energy packets, and each packet has that h, that Planck's constant's worth of energy in it, so that's why you have to multiply Planck's constant times the frequency.

我这里用光子这个词,是因为他还总结出光,必须由这些能量包组成，每个能量,包有这个h，普朗克常数代表,里面的能量，所以这就是为什么你们,要用普朗克常数乘以频率。

麻省理工公开课 - 化学原理课程节选