So, let's go back to the thrilling days of the end of the 19th century, and just take stock.

让我们回到激动人心的,19世纪末，稍微想一下。

麻省理工公开课 - 固态化学导论课程节选

It is an electron beam. In the 1890s, the latter part of the 19th century a very fashionable word was "ray."

那是个电子束，在十九世纪九十年代，就是19世纪末,一个很时髦的词汇-“光线“

麻省理工公开课 - 固态化学导论课程节选

In fact, it's interesting to note that the first calculation on the impact of CO2 on climate was done in the late 1800's by Arrhenius.

很有趣地,是阿列纽斯在19世纪末,第一个做了的关于二氧化碳,对气候的影响的计算。

麻省理工公开课 - 热力学与动力学课程节选

We didn't know a great deal about certain authors until this period of the flourishing of philology in the very late nineteenth and early twentieth century took hold and pretty much created for us the archive that we now use today in a variety of ways.

有些作家的作品,直到19世纪末20世纪初的,语言学繁荣期才为人所知,这个时期也孕育了,我们今天用来研究的文本档案。

耶鲁公开课 - 文学理论导论课程节选

What did we know at the end of the 19th century about the structure of the atom?

在19世纪末,关于原子结构我们了解多少呢？

麻省理工公开课 - 固态化学导论课程节选