英语听力：探索发现 2014-06-25 BBC 地平线：陨石的真相-19

 So this was serial¹ number one. It was built during the Apollo time. I guess because they thought there would be several of them made, but this is the first one and the last one and is the only one like it in the world. 

 

This is NASA’s Vertical² Gun Range. It was built to study how impacts affected³ the moon as the astronauts prepared to make the first lunar landing. We are armed, gated and reset⁴. Today, Professor Pete Schultz uses it to model precisely⁵ the dynamics⁶ of an asteroid⁷ impact. 

 

We know that these asteroid impacts are bad but you want to understand really how bad. 

 

Pete uses the NASA gun to fire projectiles⁸ at very high speed to simulate an asteroid hitting the Earth. 

 

So for this experiment we’re going to fire this tiny quarter-inch aluminium⁹ sphere at very high speeds up to around five kilometres per second. And then we will see what type of crater¹⁰ it produces. The target it will hit is made of sand. So we use sand because it records the shock affects very clearly. Outside of the impact chamber¹¹ are super high-speed cameras that can film at up to 1,000,000 frames per second, capturing every detail of the impact and the aftermath. Ok, lights out. Everything good?

 

Yeah.

 

Ok, we’re out of here. 

 

We have high voltage, the paddle is in, the warning lights, and rolling.

1 serial   

n.连本影片，连本电视节目；adj.连续的

参考例句：

• A new serial is starting on television tonight.今晚电视开播一部新的电视连续剧。
• Can you account for the serial failures in our experiment?你能解释我们实验屡屡失败的原因吗？

2 vertical   

adj.垂直的，顶点的，纵向的；n.垂直物，垂直的位置

参考例句：

• The northern side of the mountain is almost vertical.这座山的北坡几乎是垂直的。
• Vertical air motions are not measured by this system.垂直气流的运动不用这种系统来测量。

3 affected   

adj.不自然的，假装的

参考例句：

• She showed an affected interest in our subject.她假装对我们的课题感到兴趣。
• His manners are affected.他的态度不自然。

4 reset   

v.重新安排，复位；n.重新放置；重放之物

参考例句：

• As soon as you arrive at your destination,step out of the aircraft and reset your wristwatch.你一到达目的地，就走出飞机并重新设置手表时间。
• He is recovering from an operation to reset his arm.他做了一个手臂复位手术，正在恢复。

5 precisely   

adv.恰好，正好，精确地，细致地

参考例句：

• It's precisely that sort of slick sales-talk that I mistrust.我不相信的正是那种油腔滑调的推销宣传。
• The man adjusted very precisely.那个人调得很准。

6 dynamics   

n.力学，动力学，动力，原动力；动态

参考例句：

• In order to succeed,you must master complicated knowledge of dynamics.要取得胜利，你必须掌握很复杂的动力学知识。
• Dynamics is a discipline that cannot be mastered without extensive practice.动力学是一门不做大量习题就不能掌握的学科。

7 asteroid   

n.小行星；海盘车(动物)

参考例句：

• Astronomers have yet to witness an asteroid impact with another planet.天文学家还没有目击过小行星撞击其它行星。
• It's very unlikely that an asteroid will crash into Earth but the danger exists.小行星撞地球的可能性很小，但这样的危险还是存在的。

8 projectiles   

n.抛射体( projectile的名词复数 )；（炮弹、子弹等）射弹，（火箭等）自动推进的武器

参考例句：

• These differences are connected with the strong absorption of the composite projectiles. 这些差别与复杂的入射粒子的强烈吸收有关。 来自辞典例句
• Projectiles became more important because cannons could now fire balls over hundreds or yards. 抛射体变得更加重要，因为人们已能用大炮把炮弹射到几百码的距离之外。 来自辞典例句

9 aluminium   

n.铝 (=aluminum)

参考例句：

• Aluminium looks heavy but actually it is very light.铝看起来很重，实际上却很轻。
• If necessary, we can use aluminium instead of steel.如果必要，我们可用铝代钢。

10 crater   

n.火山口，弹坑

参考例句：

• With a telescope you can see the huge crater of Ve-suvius.用望远镜你能看到巨大的维苏威火山口。
• They came to the lip of a dead crater.他们来到了一个死火山口。

11 chamber   

n.房间，寝室；会议厅；议院；会所

参考例句：

• For many,the dentist's surgery remains a torture chamber.对许多人来说，牙医的治疗室一直是间受刑室。
• The chamber was ablaze with light.会议厅里灯火辉煌。