英语听力：探索发现 科学新发现：我们的大气层-26

 bubbles in the atmosphere.On other planets with denser¹ atmospheres,larger, more complex creatures can take to skies.The thick air could support them alofty,allowing bulky reptiles² to fly and glide³.This creature probably couldn't be able to fly very low on our planet.But even on a planet like Titan for instance,it has a surface gravity only about 50%of earth but atmosphere density⁴ at the ground level about 1.5times,even a man with wings straped on his arms could fly in atmosphere like this.So we could have creatures like this.Hegon bases his ideas on known planets and evolutionary⁵ history of earth.But it's all pure speculation⁶ untill we find life in alien atmopheres. I could be pretty thrilled,just find microbes and rocks on Mar's for instance.They don't have what kind of shapes and meat to get my blood up.I would be pretty happy to just know that life has happened twice. At present,we are alone,life may have happened just this once.And if it did,it's only because of our unique planet atmosphere.As we have soared for miles above the ground, we have journey through the ocean of air.The air would shields us,supports us and sustains us with every breath.

1 denser   

adj. 不易看透的, 密集的, 浓厚的, 愚钝的

参考例句：

• The denser population necessitates closer consolidation both for internal and external action. 住得日益稠密的居民，对内和对外都不得不更紧密地团结起来。 来自英汉非文学 - 家庭、私有制和国家的起源
• As Tito entered the neighbourhood of San Martino, he found the throng rather denser. 蒂托走近圣马丁教堂附近一带时，发现人群相当密集。

2 reptiles   

n.爬行动物，爬虫( reptile的名词复数 )

参考例句：

• Snakes and crocodiles are both reptiles. 蛇和鳄鱼都是爬行动物。 来自《简明英汉词典》
• Birds, reptiles and insects come from eggs. 鸟类、爬虫及昆虫是卵生的。 来自《现代汉英综合大词典》

3 glide   

n./v.溜，滑行；(时间)消逝

参考例句：

• We stood in silence watching the snake glide effortlessly.我们噤若寒蝉地站着，眼看那条蛇逍遥自在地游来游去。
• So graceful was the ballerina that she just seemed to glide.那芭蕾舞女演员翩跹起舞，宛如滑翔。

4 density   

n.密集，密度，浓度

参考例句：

• The population density of that country is 685 per square mile.那个国家的人口密度为每平方英里685人。
• The region has a very high population density.该地区的人口密度很高。

5 evolutionary   

adj.进化的；演化的，演变的；[生]进化论的

参考例句：

• Life has its own evolutionary process.生命有其自身的进化过程。
• These are fascinating questions to be resolved by the evolutionary studies of plants.这些十分吸引人的问题将在研究植物进化过程中得以解决。

6 speculation   

n.思索，沉思；猜测；投机

参考例句：

• Her mind is occupied with speculation.她的头脑忙于思考。
• There is widespread speculation that he is going to resign.人们普遍推测他要辞职。