英语听力：探索发现 科学新发现：我们的大气层-22

  Steven Jabs search for remaining fragments, using a custom-built metal detector¹ rig.

  Meteorites³ will have iron in them, and it's ? So not only  will magneticbe attract to it, but also metal detector will be able to pick it up. Every year, over eighteen thousand meteorites lock onto collision course with the earth.

  When meteorites encounter our atmosphere, they are travelling at the speed that they acquire moving through the vacuum  space. And typically, they are travelling at many thousands of miles per hour. 

  As they head down to earth, they cut through the outer reaches of our atmosphere. But once the meteorite² enter the mesosphere, the air starts pushing back.

   We can't see the air around us. We can only feel it on really windy days like this. But a meteorite encountering our atmosphere definitely feels the air and that is because it's travelling so quickly. When it encounters our atmosphere, the air in front of the meteorite can not get out of the way in time. It's almost like the meteorite hitting a solid wall like a block of concrete.

  As the air in front of the meteorite compresses, it also heats up to more than three thousand degrees Fahrenheit⁴. Eventually it bursts into flame, lighting⁵ up the sky. When you saw a falling meteorite or a shooting star, it's actually the protective shield of air that you see burning, not the meteorite itself.

1 detector   

n.发觉者，探测器

参考例句：

• The detector is housed in a streamlined cylindrical container.探测器安装在流线型圆柱形容器内。
• Please walk through the metal detector.请走过金属检测器。

2 meteorite   

n.陨石；流星

参考例句：

• The meteorite in Jilin Exhibition Hall is believed to be the largest in the world.吉林展览馆的陨石被认为是世界上最大的。
• The famous Murchison meteorite smashed into the Australian ground in 1969.1969年著名的默奇森陨石轰然坠落在澳大利亚。

3 meteorites   

n.陨星( meteorite的名词复数 )

参考例句：

• Small meteorites have left impact craters all over the planet's surface. 这个行星的表面布满了小块陨石留下的撞击坑。 来自《简明英汉词典》
• One theory about the existence of extraterrestrial life rests on the presence of carbon compounds in meteorites. 地球外存在生命的理论是基于陨星上存在碳化合物质这一事实的。 来自《简明英汉词典》

4 Fahrenheit   

n./adj.华氏温度；华氏温度计(的)

参考例句：

• He was asked for the boiling point of water in Fahrenheit.他被问到水的沸点是华氏多少度。
• The thermometer reads 80 degrees Fahrenheit.寒暑表指出华氏80度。

5 lighting   

n.照明，光线的明暗，舞台灯光

参考例句：

• The gas lamp gradually lost ground to electric lighting.煤气灯逐渐为电灯所代替。
• The lighting in that restaurant is soft and romantic.那个餐馆照明柔和而且浪漫。