英语听力：探索发现 科学新发现：我们的大气层-26

（单词翻译）

 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.