文章列表

• 1.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 denser atmospheres,larger, more complex creatures can take to skies.The thick air could support them a...
• 2.英语听力：探索发现 科学新发现：我们的大气层-25
• One day these manned space missions may reach out even further to distant planets with alien atmospheres, atmospheres that may support their own life ...
• 3.英语听力：探索发现 科学新发现：我们的大气层-24
• This is a genuine iron meteorite, this is believed to have once been part of the core of a long dead planet or asteroid, and this was found right here...
• 4.英语听力：探索发现 科学新发现：我们的大气层-23
• But the friction and heat wears away at the space rock, the hot air actually melts the metal surface, and often the collision with the atmosphere can ...
• 5.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 detector rig. Meteorites will have iron in them, and it's ? So not only will ma...
• 6.英语听力：探索发现 科学新发现：我们的大气层-21
• And above it the fragile air of the mesosphere is shielding us from a another deadly barrage from space. In east Texas, Jeff and Steve are searching f...
• 7.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 titanic amount of energy,some ...
• 8.英语听力：探索发现 科学新发现：我们的大气层-19
• scores of sciencse experiments on board the airship study the dramatic persure change. we call it punset for pingpang ball satelite, and it also be th...
• 9.英语听力：探索发现 科学新发现：我们的大气层-18
• The air thins and they begin to lose the protective weight of the miles of air above them. The pressure is dropping, when you finally get to the strat...
• 10.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 airs...