英语听力：探索发现 科学新发现：我们的大气层-20

 As the balloons rise higer still,they face an attact by an invisible bombardment,radiation.Every day the Sun radiates a titanic¹ amount of energy,some of them in the form of high energy of ultra violet rays.These rays packed a powerful punch ,and in the high up atmoshpere they attack the structures of the piles of balloon.The UV literaly damages the material,you start getting the microscopic² cracks on the materials which makes a brindle and eventually just fails and the balloon pops.The rays are potential killers,both for balloons and human.They bombard our cells and DNA,triggering cancers.But around 7 miles up, a layer in the atmosphere shields us from 99% of this rays.It's made up of ozone³,a rare monecule of three-bonded oxigen atoms.This can absorve and block high energy UV rays.The ozone layer is not like the saran wrap,thick layer the boundary that you past through.It's actually miles and miles thick,so it's a slow diminishment.Man made chemicals used in refregeraters and aerosols⁴ have been eating away this delicate protective layer.Every winter,holes in the shield appears in the poles.The harmful chemicals are now banned and the layer is beginning to recover.

1 titanic   

adj.巨人的，庞大的，强大的

参考例句：

• We have been making titanic effort to achieve our purpose.我们一直在作极大的努力，以达到我们的目的。
• The island was created by titanic powers and they are still at work today.台湾岛是由一个至今仍然在运作的巨大力量塑造出来的。

2 microscopic   

adj.微小的，细微的，极小的，显微的

参考例句：

• It's impossible to read his microscopic handwriting.不可能看清他那极小的书写字迹。
• A plant's lungs are the microscopic pores in its leaves.植物的肺就是其叶片上微细的气孔。

3 ozone   

n.臭氧，新鲜空气

参考例句：

• The ozone layer is a protective layer around the planet Earth.臭氧层是地球的保护层。
• The capacity of ozone can adjust according of requirement.臭氧的产量可根据需要或调节。

4 aerosols   

n.气溶胶( aerosol的名词复数 )；喷雾剂；（气体中的）浮粒；喷雾器

参考例句：

• Aerosols are present throughout the atmosphere. 气溶胶存在于整个大气层。 来自辞典例句
• Deodorants are available as aerosols or roll-ons. 除臭剂有喷雾装或滚抹装。 来自辞典例句