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 vibrational² 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 molecules⁴, as you saw in the beginning, the building blocks had springs connecting them to each other.  这些分子正如你们开始时看到的是基本组成，它们之间有弹簧连接着。

　　In fact, molecules are able to vibrate at a set of frequencies which are very specific for each molecule³ and for the bonds connecting them. 事实上，分子可以在一定的频率下震动，每一个不同的分子和不同的连接方式都有特定的频率。

　　So this is the sound of the O-H stretch, translated into the audible range.  所以这是O-H键发出的声音，转化成人耳可以听到的频率。

　　S-H, quite a different frequency.  S-H键，有十分不同的频率。

　　Now, this is kind of interesting, because it tells you that you should be looking for a particular fact,  现在看来这十分有趣，因为它告诉你，你应该寻找一个独特的事实，

　　which is this: nothing in the world smells like rotten eggs except S-H, OK? 事实是：除了S-H以外，没有其他东西闻起来像臭鸡蛋。

　　Now, Fact B: nothing in the world has that frequency except S-H.  第二个事实就是：除了S-H，没有其他东西有那样的频率。

　　If you look on this, imagine a piano keyboard.  如果你看到这些，想象一下钢琴的键盘。

　　The S-H stretch is in the middle of a part of the keyboard that has been, so to speak, damaged,  S-H键是在键盘的中间部分，可以说键盘的那部分损坏了，

　　and there are no neighboring notes, nothing is close to it.  也没有其他的音符挨着它。

　　You have a unique smell, a unique vibration¹. 你得到的是一个独特的味道，一种独特的震动。

1 vibration   

n.颤动，振动；摆动

参考例句：

• There is so much vibration on a ship that one cannot write.船上的震动大得使人无法书写。
• The vibration of the window woke me up.窗子的震动把我惊醒了。

2 vibrational   

adj.振动的，摇摆的

参考例句：

• However, heating energizes the vibrational, rotational, and electronic motions all at once. 但是，加热会一下子把振动、转动和电子运动统统加强。 来自英汉非文学 - 科技
• Such photons will excite the higher vibrational levels of the OH molecule. 这种光子会激发OH分子的较高振动能级。 来自辞典例句

3 molecule   

n.分子，克分子

参考例句：

• A molecule of water is made up of two atoms of hygrogen and one atom of oxygen.一个水分子是由P妈̬f婘̬ 妈̬成的。
• This gives us the structural formula of the molecule.这种方式给出了分子的结构式。

4 molecules   

分子( molecule的名词复数 )

参考例句：

• The structure of molecules can be seen under an electron microscope. 分子的结构可在电子显微镜下观察到。
• Inside the reactor the large molecules are cracked into smaller molecules. 在反应堆里，大分子裂变为小分子。