英语听力：自然百科 探索世界奥秘之FBI(揭密联邦调查局)Unit3

Back at the explosives lab, examiners use a high-tech¹ instrument called a Raman spectrometer, a device that determines if a package contains explosive material.

With the Raman, what we are doing is that we are using, a, a light source to go into the container and actually get a spectrum² off of the substance inside the container. There we're actually able to examine a suspected explosive substance without even having to open the container. And that's great for in the laboratory when you don't wanna put yourself at risk any further than you have to.

At the federal building in Oklahoma City, no secondary devices are found. But while the nation is horrified³ at the carnage. The Explosives Unit is quickly searching the wreckage⁴ for evidence to be used in a test called: residue⁵ analysis. This helps the FBI determine what chemicals fuel the blast.

First thing that happens is... is that the part of our unit that does the residue analysis takes the evidence, extracts anything that they can find from there that would help them identify the explosives.

Within hours, residue analysis pinpoints⁶ a key piece of evidence.

There we were fortunate that we actually did find a piece of debris⁷ that had some of the ammonium nitrate prills that were still embedded⁸ in it. And from those prills, we were able to conclude that it was an ammonium nitrate based explosive.

From these findings the FBI concludes that a fertilizer bomb was used in the most deadly terrorist attack on US soil. Now the search for a suspect begins. The challenge for the Explosives Unit is to determine how the massive bomb was brought to the scene.

If it's a very large bombing, it's probably gonna be a vehicle. So we wanna try to identify that vehicle as quickly as we can. And here you can see some pieces that we did in a test with a vehicle. And you can just see the extent to which these are mangled⁹ by the explosion.

Within a short time, investigators¹⁰ located the axle of a truck that was blown nearly 600 feet away from the federal building.

From that axle, the bomb technicians who were at the scene were able to very quickly identify it as having come from the bomb vehicle, and then they were able to give that information to other investigators who tracked it back to the rental¹¹ facility.

In less than a day, suspected bomber¹² Timothy McVeigh is taken into custody¹³. But examiners investigating the murder of the New Jersey¹⁴ ad executive are not so lucky. With no sign of a suspect, they focus their attention on the bomb itself and begin a process known as device analysis.

When we're doing an analysis of a device, what we were trying to do is simply to identify the components¹⁵ found there, and trying to see if we can figure out how they were put together, how they worked, or in some cases, how they didn't work?

Raman spectrometer: a device to analyze the intensity of Raman scattering of monochromatic light (单色光) as a function of frequency of the scattered light; the information obtained is useful for determining molecular structure

carnage: great and usually bloody slaughter or injury (as in battle)

mangle: to mutilate or disfigure by battering, hacking, cutting, or tearing

1 high-tech   

adj.高科技的

参考例句：

• The economy is in the upswing which makes high-tech services in more demand too.经济在蓬勃发展，这就使对高科技服务的需求量也在加大。
• The quest of a cure for disease with high-tech has never ceased. 人们希望运用高科技治疗疾病的追求从未停止过。

2 spectrum   

n.谱，光谱，频谱；范围，幅度，系列

参考例句：

• This is a kind of atomic spectrum.这是一种原子光谱。
• We have known much of the constitution of the solar spectrum.关于太阳光谱的构成，我们已了解不少。

3 horrified   

a.(表现出)恐惧的

参考例句：

• The whole country was horrified by the killings. 全国都对这些凶杀案感到大为震惊。
• We were horrified at the conditions prevailing in local prisons. 地方监狱的普遍状况让我们震惊。

4 wreckage   

n.（失事飞机等的）残骸，破坏，毁坏

参考例句：

• They hauled him clear of the wreckage.他们把他从形骸中拖出来。
• New states were born out of the wreckage of old colonial empires.新生国家从老殖民帝国的废墟中诞生。

5 residue   

n.残余，剩余，残渣

参考例句：

• Mary scraped the residue of food from the plates before putting them under water.玛丽在把盘子放入水之前先刮去上面的食物残渣。
• Pesticide persistence beyond the critical period for control leads to residue problems.农药一旦超过控制的临界期，就会导致残留问题。

6 pinpoints   

准确地找出或描述( pinpoint的第三人称单数 )； 为…准确定位

参考例句：

• The bombs hit the pinpoints at which they were aimed. 炸弹精确地击中了目标。
• There's really no point in arguing about pinpoints. 为芝麻绿豆般的小事争论实在毫无意义。

7 debris   

n.瓦砾堆，废墟，碎片

参考例句：

• After the bombing there was a lot of debris everywhere.轰炸之后到处瓦砾成堆。
• Bacteria sticks to food debris in the teeth,causing decay.细菌附着在牙缝中的食物残渣上，导致蛀牙。

8 embedded   

a.扎牢的

参考例句：

• an operation to remove glass that was embedded in his leg 取出扎入他腿部玻璃的手术
• He has embedded his name in the minds of millions of people. 他的名字铭刻在数百万人民心中。

9 mangled   

vt.乱砍（mangle的过去式与过去分词形式）

参考例句：

• His hand was mangled in the machine. 他的手卷到机器里轧烂了。
• He was off work because he'd mangled his hand in a machine. 他没上班，因为他的手给机器严重压伤了。 来自《简明英汉词典》

10 investigators   

n.调查者，审查者( investigator的名词复数 )

参考例句：

• This memo could be the smoking gun that investigators have been looking for. 这份备忘录可能是调查人员一直在寻找的证据。
• The team consisted of six investigators and two secretaries. 这个团队由六个调查人员和两个秘书组成。 来自《简明英汉词典》

11 rental   

n.租赁，出租，出租业

参考例句：

• The yearly rental of her house is 2400 yuan.她这房子年租金是2400元。
• We can organise car rental from Chicago O'Hare Airport.我们可以安排提供从芝加哥奥黑尔机场出发的租车服务。

12 bomber   

n.轰炸机，投弹手，投掷炸弹者

参考例句：

• He flew a bomber during the war.他在战时驾驶轰炸机。
• Detectives hunting the London bombers will be keen to interview him.追查伦敦爆炸案凶犯的侦探们急于对他进行讯问。

13 custody   

n.监护，照看，羁押，拘留

参考例句：

• He spent a week in custody on remand awaiting sentence.等候判决期间他被还押候审一个星期。
• He was taken into custody immediately after the robbery.抢劫案发生后，他立即被押了起来。

14 jersey   

n.运动衫

参考例句：

• He wears a cotton jersey when he plays football.他穿运动衫踢足球。
• They were dressed alike in blue jersey and knickers.他们穿着一致，都是蓝色的运动衫和灯笼短裤。

15 components   

（机器、设备等的）构成要素，零件，成分； 成分( component的名词复数 )； [物理化学]组分； [数学]分量； （混合物的）组成部分

参考例句：

• the components of a machine 机器部件
• Our chemistry teacher often reduces a compound to its components in lab. 在实验室中化学老师常把化合物分解为各种成分。