At the beginning of the nineteenth century, in 1800, paper was handmade out of cloth-- that's the way they made it.

在19世纪初叶，即1800年，当时的人用布料手工制纸。

耶鲁公开课 - 金融市场课程节选

Let's go back to the nineteenth century, that's the 1800s, that was a wonderful century for information technology.

让我们一起回到19世纪初叶，这对信息技术来说是大好的一个世纪。

耶鲁公开课 - 金融市场课程节选