800 students at Harvard each year, about 1800 students are members of PBHA That's not all.

每年哈佛有，约1800名学生是,的成员，PBHA，。,不仅如此。

哈佛公开课 - 幸福课课程节选

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

And he actually did this in the late 1800's, back before even all of the elements that we know today were discovered, really only about 60% or so, 70% were discovered then that we now know today.

他最终在十九世纪晚期完成了这一壮举，难能可贵的是,虽然我们现在已经发现了所有的元素，但在当时已知的元素只有我们现在知道,百分之六七十，在这种情况下。

麻省理工公开课 - 化学原理课程节选

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

That's a good thing. And instead of 17 million calls, I have 1800 calls.

真好，我们只调用了1800次函数,而不是一开始的1百70万次。

麻省理工公开课 - 计算机科学及编程导论课程节选

And after the periodic table was developed in the late 1800's, people didn't understand this quite as well, they took things a little more literally.

在十九世纪后期元素周期表经过发展之后，人们还没有很好地意识到这一点，他们的认识还有些粗浅。

麻省理工公开课 - 化学原理课程节选

And if you go back into the 1800's when thermodynamics was starting, there were a zillion different temperatures scales Everybody had their own favorite temperature scale The one that we're most familiar with is the centigrade or Celsius scale where mercury was the substance, and the volume of mercury is the property.

如果你回头看看19世纪温度计,刚开始使用的时候，那时有不计其数的不同温标,每个人都有他们自己最喜欢的温标,我们最熟悉的是,摄氏温标，用水银,作为工作物质，水银的体积是所用的性质。

麻省理工公开课 - 热力学与动力学课程节选

That's 1800 times faster. But the real one that blows me away is, it has 2 gig of memory inside of it. That's 12 thousand times more memory. Oh, and by the way?

比以前快了1800倍,但是真让我感到吃惊的是,它有2G的内存，这是以前的12000倍,顺便说一句我的？

麻省理工公开课 - 计算机科学及编程导论课程节选