标签：自然百科 相关文章
旱灾的成因与影响 Its signs are subtle and slow: the earth dries; water levels fall; the rains do not come; and the land is gripped by drought. At its most basic, a drought occurs when more water is used than isreplenished. It is a balance bet
自然百科2016年
Archaeologists have found cavities that they can fill with plaster to create molds. They are able to see, hundreds of years later, exactly how the dead lay when the volcano struck. They have also found bones. So far, the remains of 1100 people have b
自然百科2015年
-I'm exhausted. -Are you okay? -Yeah, it's too hot. It's okay, but look at this place. -How did you find this place? -It's not easy to find, but this is what I like. You know, here we are. It's ** part of Bolognia, really unassuming. You wouldn't eve
自然百科2015年
I'm going on the serious stoning adventures,traveling along the three mighty rivers on the planet.This river has given rise to some the world great civilazations.For centuries ,they worship their life in giving waters,and fear their awesome distructi
自然百科2015年
It's the talk of Minke whales,one of the smallest of great whales.The turtle has swam from far away as islands in the south pacific.But the whale have travelled considerably further,all the way from Antactic.They come to Ribonwaves,south of Rain Isla
自然百科2014年
While Europe lingered in the Dark Ages, the splendor of the Maya world was reaching its zenith. Their temples soared hundreds of feet into the heavens. They developed a system of hieroglyphic writing. Works of art and sculpture displayed the Maya's i
自然百科2009年
The secret of the diamond lies in the carbon bond. Carbon is one of the most plentiful substances known to science. We find carbon in plants, animals and our bodies. Carbon everywhere. And yet diamonds are some of the rarest, most beautiful of all su
自然百科2009年
Trastevere is one of the Rome's most ancient neighborhoods. Founded during the reign of Emperor Augustus, its name means literally across the Tiber. But more than a river separates the people of Trastevere from the rest of the city, Trasteverini have
自然百科2009年
Over centuries, the Irish built a rich heritage of castles and monuments, using an abundance of local stone. Now many of the structures are damaged. The stone is decaying. Thanks in part to Irelands notoriously damp weather, these sites are in danger
自然百科2009年
This is a patas monkey, military looking with a fine mustache. It's at home in Savannas, where its too dry for jungle trees. Monkeys have been leaving the trees for millions of years, but we are the only ape to do so. Some of what makes us special co
自然百科2009年
They are considered the only wild horses left in the world. The takhi, known as Przewalski horses in the west, don't look like their domastic cousins, they are noted for their large heads, stiff zebra like meats, pop bellies, and short stocky legs, a
自然百科2009年
One of the Australian state of New South Wales favorite ocean-living icons is Bluey, the blue groper. Their friendly nature makes them a favorite of divers. It's magical, like any type of marine species. You know, if you can scuba dive or snorkel alo
自然百科2009年
Scientists have confirmed for the first time that Australia was once home to a theropod dinosaur that was big, fast and terrifying, not unlike the Velociraptor featured in the movie Jurassic Park. It was an 1,100 pound meat-eating predator with three
自然百科2009年
A walking humanoid robot(类人机器人) able to use its whole face and body to express emotion was unveiled this week in Japan. The robot was created by scientists at Tokyo's Waseda University and its makers say its the first of its kind. It is abl
自然百科2009年
As five European foreign ministers meet in Copenhagen to prepare for an aggreement to succeed the Kyoto Protocol, scientists in Greenland are warning about accelerated glacier melts. Several years ago, scientists reported that the Helheim Glacier, su
自然百科2009年
The picturesque Western Cape mountain range at the southern tip of Africa lays claim to one of the world's most diverse floral kingdoms. And researchers are scouring the mountains in search of the droppings and urine of a small local inhabitant which
自然百科2009年
Praised far and wide for the reputed healing powers of its minerals and waters, the Dead Sea has been luring visitors for thousands of years. But these days tourists see a very different lake from the one that others would have witnessed a few decade
自然百科2009年
This week on Why? Tell Me Why! We are answering a viewer question as to why lightning bugs light up. Lightning bugs light up basically to find a mate. Its a way that lightning bugs communicate with each other, to call each other together, because som
自然百科2009年
At 10 years old, Maddie the Great Dan is feeling her age, arthritis and damaged nerves in her spine weakened her hind legs and brought her pain. It got so bad she had trouble walking and spent months on steroids. She faced possible surgery, but then
自然百科2009年
Many animals are born into volatile and treacherous communities. Lion cubs start by avoiding the pride. Mothers behave as though society were a dangerous thing. The cubs are born blind and helpless; and she hides them for the first six weeks, visitin
自然百科2009年