TED演讲：气味背后的科学(8)

OK, great, we smell vibrations. How? All right? 好吧，我们闻到的是震动。怎么闻到呢？ Now when people ask this kind of question, they neglect something, which is that physicists are really clever, unlike biologists. 当人们问这个问

TED演讲：气味背后的科学(7)

However, I managed to get a hold of a Borane eventually, and here is the beast. 无论如何，我最终得到了一些硼烷，这就是那个怪物。 And it really does have the same -- if you calculate, if you measure the vibrational frequencies,

TED演讲：气味背后的科学(6)

So I went searching when I started in this game to convince myself that there was any degree of plausibility to this whole crazy story. 在这个游戏的最初，我就开始寻找说服我自己，这个理论有一定的合理性，这整个故事有

TED演讲：气味背后的科学(5)

And...but...but...we have to go a little beyond that. 我们需要进一步深入。 Now let me explain why vibrational theory has some sort of interest in it. 现在我来解释为什么震动理论有一定的道理。 These molecules, as you saw i

TED演讲：气味背后的科学(4)

Here's how shape works in normal receptors. 这里展示的是形状是如何对通常的感受器起作用的。 You have a molecule coming in, it gets into the protein, which is schematic here, 一个分子进来，进到蛋白质里，图中所示意

TED演讲：气味背后的科学(3)

This smells of cut grass. Now, this is the skeleton of the molecule. 它闻起来就像割下来青草。这就是分子的骨架。 If you dress it up with atoms, hydrogen atoms -- that's what it looks like when you have it on your computer -- but a

TED演讲：气味背后的科学(2)

Now, while the smell wafts over you, let me tell you the history of an idea. 现在，趁着香味还萦绕在你们周围，我来为你们介绍一个想法形成的过程。 Everything that you're smelling in here is made up of atoms that come fro

TED演讲：拥有大脑的真正原因(3)

But let me show you cutting-edge robotics. 现在我来介绍一下最高端的机器人技术。 Now a lot of robotics is very impressive, but manipulation robotics is really just in the dark ages. 如今许多项机器人技术已经相当厉害，可

TED演讲：拥有大脑的真正原因(2)

So I am a movement chauvinist. I believe movement is the most important function of the brain -- don't let anyone tell you that it's not true. 所以说，我是个运动沙文主义者，我认为运动是大脑最重要的功能，不要让别人告诉

TED演讲：拥有大脑的真正原因(1)

I'm a neuroscientist. And in neuroscience, we have to deal with many difficult questions about the brain. 我是个神经生物学家。在神经生物学研究里，我们需要处理很多关于大脑的难题。 But I want to start with the easies

TED演讲：气味背后的科学(12)

OK? Now, we're dealing with people who only want results, and this is the commercial world. 今天，我们在和只在乎结果的人们打交道，这是一个商业的世界。 And they tell us that even if we do it by astrology, they're happy, OK

TED演讲：气味背后的科学(10)

Now, coumarin is a very common thing, a material, in fragrance which is derived from a bean that comes from South America. 香豆素是香水中一个十分平常的原料，从来自南美的豆子中提炼出来的。 And it is the classic syntheti

名校励志英语演讲 09:给大学毕业生的几个忠告

I am extremely privileged to be part of the Obama administration. If there ever was a time to help steer America and the world towards a path of sustainable energy, now is the time. 能够成为奥巴马政府的一员，我感到极其荣幸。如果有

名校励志英语演讲 08:给大学毕业生的几个忠告

The climate problem is the unintended consequence of our success. We depend on fossil energy to keep our homes warm in the winter, cool in the summer, and lit at night; we use it to travel across town and across continents. Energy is a fundamental re

名校励志英语演讲 07:给大学毕业生的几个忠告

If the world continues on a business-as-usual path, the Intergovernmental Panel on Climate Change predicts that there is a fifty-fifty chance the temperature will exceed 5 degrees by the end of this century. This increase may not sound like much, but

名校励志英语演讲 06:给大学毕业生的几个忠告

I began teaching with the idea of giving back; But I received more than I gave. This brings me to the final movement of this speech. It begins with a story about an extraordinary scientific discovery and a newdilemmathat it poses. Its a call to arms

名校励志英语演讲 05:给大学毕业生的几个忠告

After nine years at Bell labs, I decided to leave that warm, cozyivory towerfor what I considered to be the real world, a university. Bell Labs, to quote what was said about Mary Poppins, was practically perfect in every way, but I wanted to leave be

名校励志英语演讲 04:给大学毕业生的几个忠告

Jimmy Stewart,as Elwood P.Dowd in the movie Harvey got it exactly right. (Now, forgive me, I don't believe in jimmy Stenart's story very well, but...)Years ago my mother used to say to me, 'In this world, Elwwod, you must be...she always used to call

名校励志英语演讲 03:给大学毕业生的几个忠告

My address will follow the classical sonata form of commencement addresses. The first movement, just presented, were light-hearted remarks. This next movement consists of unsolicited advice, which is rarely valued, seldom remembered, never followed.

名校励志英语演讲 02:给大学毕业生的几个忠告

Another difficulty with giving a Harvard commencement address is that some students may disapprove of the fact that I will borrow material from previous speeches, as well from others. I ask that you forgive me for two reasons. 在哈佛大学毕业典礼