英语听力：探索发现 科学新发现：我们的大气层-17

 You could use the balloons not just to go to the edge of the space as we do now,but go all the way over the line, and actually to use balloons or airships to go all the way into  space,space travel without rocket.Officially,  the atmosphere ends and space begins 62 miles up.This sounds high, bu t on a table top globe, that would only be as thick as a coat of varnish¹. And in reallity, the air extends out much farther.The atmosphere's lowest layer,the troposphere we live in,ends 40000 feet up, the cruising altitude of the airliners². Above are another 4 distinctive³ layers.They are seperated by the temperature,it's jus colder and colder and colder, that warms to nights host zero.And you start to get colder ,en,so whenever the temperature changes directions,you know you have made into anoter layer.First comes the stratosphere layer,a stable layer without strong winds.Then temperature in the messosphere plunges⁴ into minus 150 degrees Fahrenheit⁵. Above that is the thermosphere, where the sollar readiation can push the thermometer back up to 4500 degrees.And finally,there is exosphere,an endless zone where the air molecues slowly thin out into the pure vicuum of space.The exosphere is really high, they actually detected the particles of the earth atmosphere on the far side of  the moon. As pile of balloons rise towards the space,they leave world we know far behind.

1 varnish   

n.清漆；v.上清漆；粉饰

参考例句：

• He tried to varnish over the facts,but it was useless.他想粉饰事实，但那是徒劳的。
• He applied varnish to the table.他给那张桌子涂上清漆。

2 airliners   

n.客机，班机( airliner的名词复数 )

参考例句：

• The fog grounded the airliners. 大雾迫使班机停飞。 来自《简明英汉词典》
• They placed very stable and accurate atomic clocks on regularly scheduled jet airliners. 他们将非常稳定、准确的原子钟装在定期飞行的喷气式班机上。 来自辞典例句

3 distinctive   

adj.特别的，有特色的，与众不同的

参考例句：

• She has a very distinctive way of walking.她走路的样子与别人很不相同。
• This bird has several distinctive features.这个鸟具有几种突出的特征。

4 plunges   

n.跳进，投入vt.使投入，使插入，使陷入vi.投入，跳进，陷入v.颠簸( plunge的第三人称单数 )；暴跌；骤降；突降

参考例句：

• Even before he plunges into his program, he has his audience in his pocket. 他的节目甚至还没有出场，就已控制住了观众。 来自《简明英汉词典》
• 'Monseigneur, he precipitated himself over the hill-side, head first, as a person plunges into the river.' “大人，他头冲下跳下山坡去了，像往河里跳一样。” 来自英汉文学 - 双城记

5 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。