标签：保护地球 相关文章
New Earth-Size Planet Found 地球大小的新行星被发现 Not too big, not too small. Not too hot, not too cold. A newly discovered planet looks just right for life as we know it, according to an international group of astronomers. 不太大又不太
VOA标准英语2014年(四月)
Further south still, unstooped, shrouded figures end the flat monotony of the Tundra. This is the tree line, the first place on our journey with sufficient warmth and liquid water to enable a tree to grow。 Surviving here is so crushingly difficult
自然百科2012年
The bison/ form a defensive circle around their young, horns pointing outwards. The wolves need the bison to break rank, but the tables are turning and now the wolves have to retreat. The pack focus their attention on the rear of the herd and the bis
自然百科2012年
As the warm, humid air from the south meets the cold Antarctica, the moisture recurrence crystallizes and snow flakes form from this kind. Each crystal forms around a particle of dust. All have a six folds in the shape, but no two have ever been foun
自然百科2012年
The Taiga forest marks the end of our journey through the Arctic from the frozen ocean down across the lands that surround it The other end of our planet, the Antarctic is starkly different. A frozen continent completely surrounded by ocean. Icebergs
自然百科2012年
The most powerful atom smasher ever built could make some bizarre discoveries, such as new forces of nature or even extra dimensions of space, after it's switched on in August. The Large Hadron Collider, or LHC, basically consists of a ring of super
国家地理2008年
Its a global call to action directed at every person, government, business and community across the planet, the message: Lights off for one hour at 8:30 PM on Saturday, March 27th. Four thousand cities and towns in 88 countries plunged themselves int
万花筒2010年
The most powerful atom smasher ever built could make some bizarre discoveries, such as new forces of nature or even extra dimensions of space, after it's switched on in August. The Large Hadron Collider, or LHC, basically consists of a ring of superc
自然百科2008年
The solar system is a hostile place. Earth is under attack from deadly cosmic radiation. Life here is only possible, because it's protected by the magnetosphere, an invisible force field that cocoons the planet. But new evidence reveals that this vit
自然百科2011年
As the reversal approaches, the decay of our magnetic field will continue and cosmic radiation will get increasingly close to the Earth's surface. As the reversal approaches, the decay of our magnetic field will continue and cosmic radiation will get
自然百科2011年
We drive them about 20 miles away to the North, and release them, and we track them as they try to fly back home. We drive them about 20 miles away to the North, and release them, and we track them as they try to fly back home. Hes up, OK. Holland wa
自然百科2011年
By analyzing different samples of lava, Herrero / Bervera has built up a picture of how the filed has changed since long before humans were around. They are actually the recorders of the Earth's magnetic field in hundreds of years, thousands of years
自然百科2011年
Blockson's computer model reveals that at the South Atlantic Anomaly, the magnetic field isn't just weaker than anywhere else on the planet. It's actually reversed polarity. There is a patch on the core in the South Atlantic where things are not poin
自然百科2011年
Every summer over 40 million penguins take to the southern ocean to feed. They're joined by thousands of whales，minks are the most numerous. They all come here to harvest the richest ocean on earth. Carrying on south, we have our first glimpse of t
自然百科2012年
地球是太阳系从内到外的第三颗行星，也是太阳系中直径、质量和密度最大的类地行星。它也经常被称作世界。英语的地球Earth一词来自于古英语及日耳曼语。地球已有44～46亿岁，有一颗天然
英语听力文摘 English Digest
The Time Before Fire What is fire anyway? Well, fire is rapid oxidization . Its the energy released when oxygen atoms start combining with carbon and hydrogen atoms. Exactly, so without oxygen in the air, nothing burns. You mean there was a time befo
英语听力文摘 English Digest
Brazil and China have failed in their mission to launch a climate-monitoring satellite into orbit on Monday. The China-Brazil Earth Resources Satellite 3, or CBERS-3 was destroyed after a Chinese Long March 4B rocket launched from northern Chinas Tai
CCTV9英语新闻2013年12月
These ice blocks are the size of sky creepers, and this is the bill of more glance with scoten seize man somehow travel on foot. It is one hundred miles long and one of the largest species on earth. Not nothing could prepare those early ex-dollars fo
自然百科2012年
Serious produce server Neser Balwich directs from the front seat while aerial cameraman Mike Calen controls the camera attached to the lows. Above 10,000 feet, the pilot must breathe oxygen through a passed tool beneath the nostrils. Approaching the
自然百科2012年
The Front End of the Earth 火流星看上去非常明亮，像条闪闪发光的巨大火龙，发着沙沙的响声，有时还有爆炸声。有的火流星甚至在白天也能看到。火流星的出现是因为它的流星体质量较大(质量大
英语听力文摘 English Digest