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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“
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The most famous part of Fifth Avenue is probably in the 80th and 90th
第五大道最有名的部分可能是在第八十和第九十街，
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I've been here in MIT for thirty years, and in the early nineties I taught the large freshmen physics course, and electromagnetism.
我麻省理工工作三十年了，在上世纪九十年代初,我就开始给大一新生上物理课，以及电磁学。
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It happened in the late 1990s, in the United States, that patent offices started to accept financial patents.
美国是在上世纪九十年代末期的时候，专利局才开始授予金融专利。
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So, what we're going to define is just let's just capture 90% of that electron density.
所以，我们所定义的,只包括百分之九十的电子密度。
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In 1665, 93% of the people that died in that year died of infectious diseases.
在一六六五年死亡的总人数中,百分之九十三都是死于感染性疾病
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When you get up into the 80th and 90th, it's residential and cultural.
走进第八十街和第九十街，你会看到有着浓厚文化底蕴的住宅区。
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She was, I don't know, ninety and she married some sixty-year-old Confederate veteran at some point in time.
她大概有,大概有,九十岁,她在某个时期嫁给了一个,六十岁的南部邦联老兵
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Ninety-percent of all the books that were published before Peter were devotional texts in the church.
彼得之前的百分之九十的书籍,都是教堂里的祈祷文
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I had an opportunity in the late 80s and early 90s, working with a small foundation in New York, to begin cultural activities in Vietnam before normalization of relations between the US and Vietnam.
我在八十年代末九十年代初曾经有幸，在纽约的一个小型基金会工作，和越南开展一些文化活动,那时美国和越南还未实现外交关系正常化。
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There was... a few years there, I think, in the early nineties,
我想在几年前，也就是九十年代初，
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Almost ninety percent of the university is all white, all male.
几乎百分之九十的大学生都是白人，都是男的。
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First is that, during the '90s, I think the Chinese IT market was very, very small.
第一，在九十年代，中国的互联网市场规模很小。
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It's quite spectacular because here in the 1890s we have the apex of the Western classical orchestra, this big, beautiful, powerful instrument.
它之所以雄壮因为在十九世纪九十年代,西方古典管风琴正处于顶峰,这是一种巨大,美丽,有力量的乐器
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You better believe it's sixty to seventy percent, and the further back you go in American history the closer it is to ninety and ninety-five percent.
你最好猜百分之六七十,要是你以后有机会学习美国历史的话,你会发现它在百分之九十到九十五之间
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And we need not, we just make sure we can't do that So, go ahead, we've got you on number The 1980's and 1990's, this deal seemed to work.
这一点我们必须明确,那么。。。说吧，该给的数据我都说了,其实，八，九十年代那会儿，那个协议还是起过作用。
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And I think it was... The one-way ticket was 90 euros.
我觉得它…它的单程票是九十欧元。
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they start from 80 or 90, the cheapest ones.
最便宜是八十或者九十英镑。
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He's just had his 90th birthday.
事实上，他刚过了九十岁生日。
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And where we where at the start of the 20th Century in the late 1890's is that we were at a place where there was great confidence in our understanding of the universe, and our understanding of how all matter worked.
0世纪开始讲起,在19世纪的九十年代,人们对于自己,对自然的理解,对自然所有物质,如何工作的理解十分自信。
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Also, the filing cabinet-- that sounds like a minor thing-- was invented in the 1890s.
还有档案橱柜-,听起来很微不足道-,是在19世纪九十年代发明的。
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But what you've got at the top are the early 1790s and I think 1820 in terms of slave population in the American south.
一般,你们会认为南方的奴隶数量,达到高峰是在十八世纪九十年代,而我却认为1820年更准确
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We had a bubble in the stock market in the '90s and it collapsed after 2000 and with that it brought the economy down.
我们在九十年代股票市场中有泡沫,并且它在2000年崩塌了0,这使得经济一度低迷。
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Particularly the course I taught in the early nineties have 600 students there.
尤其是我在九十年代讲的物理课,有600多个学生。
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And one common way to think about it, is to think about the value of r, or the radius, below which 90% of that electron density is going to be contained.
而通常的想法，是想象，r，的值，也就是半径的值，即有百分之九十的电子密度,都落在这个范围之内。
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I wish the Fed had behaved better they didn't seem to recognize the bubbles that we had in the stock market in the '90s and the housing in the 2000s.
从某种意义上说，我希望,政府没有发现出来,九十年代的股票市场泡沫,和新世纪房地产的泡沫。
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We've seen the price of oil, lately, move all over the map. It went up to $100 recently and it was just as late as late 1990s that it was under $20 and people just don't know where it's going to go.
我们都能看到现在石油的价格，一路飙升，最近达到每桶一百美元,而在上世纪九十年代末,每桶石油还不到二十美元0,人们根本无法预想石油价格,还会飙升到什么地步。
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Yeah, 90 euros. So quite all right.
是的，九十欧元。所以还不错。
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So we're not saying it's all the electron density, it's just 90%.
因此我们并没有说所有的电子密度，而是百分之九十。
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