英语听力：自然百科 黄石公园的夏天 Yellowstone—6

As the migrating herds arrive in the plateaus river valleys, the spring is here. This is why they have made the journey after the famine of winter. Food is everywhere. Birds have flown in from as far away as the Arctic and subtropics. Canada geese jo

英语听力：自然百科 黄石公园的夏天 Yellowstone—5

As 6 months of snow and ice begins to melt, Yellowstone starts to come back to life. Cascading snowmelt swells the streams and rivers. It's a hazard that the migrating herds must cross. Young are barely up to the task. The Yellowstone river has incre

英语听力：自然百科 黄石公园的夏天 Yellowstone—4

Clues to why the herds are drawn to the Yellowstone plateau lie in its deep and unique history. This plateau is the created bowl of a huge sleeping volcano. And melting rock below the surface still pushes the land up to the cold of high altitude. But

英语听力：自然百科 黄石公园的夏天 Yellowstone—3

This mother bear's experience gives her family a good chance of survival until spring arrives. They will return again and again as the thaw releases more fish. On the warmer plains and valleys that surround the plateau, grazers are on the move. They

英语听力：自然百科 黄石公园的夏天 Yellowstone—2

The end of winter comes late to the mountainous northwest of the United States, and in particular, it lingers in Yellowstone. The heart of Yellowstone is a high cold plateau, 8,000 / feet up, surround by the spires of the Rocky Mountains. After five

英语听力：自然百科 黄石公园的夏天 Yellowstone—8

This pack seem prepared to allow their young a brief foray to experience the world beyond their den. Even in Yellow Stone it is extremely rare to see wolf pups like this. Before long they are summoned back into the forest by the pack. It will be wint

英语听力：自然百科 Coastal Cleanup 净滩大行动

So, every year at this time, nearly half a million people step forward to help, to volunteer in an international coastal cleanup and the results can be staggering. In the last couple of years alone, an average of 8 million pounds of trash is collecte

英语听力：自然百科 圣河之旅 The Nile尼罗河—1

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

英语听力：自然百科 真实的庞贝—16

So here we find ourselves in one of the other restaurants that have been excavated in this town block. As customers would come up through this long passage way, they'd reach the end of the property, where they would find, out on the left hand side he

英语听力：自然百科 真实的庞贝—17

In fact, even the lower class citizens have access to a wide range of foods. They benefit directly from the power of the Roman empire, vast trade networks that bring in goods from thousands of miles away. When archaeologists looked the drain from one

英语听力：自然百科 意大利风情:The Art of the Feast—11

This great painting was commissioned for Bolognia's son Dominic Church. And you can just imagine the impact would have had as you stared at it over mass. -Certainly draws your eyes to the drama. -Yeah, it's a drama. -It's the massacre of the innocenc

英语听力：自然百科 意大利风情:The Art of the Feast—10

-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

英语听力：自然百科 意大利风情:The Art of the Feast—9

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英语听力：自然百科 意大利风情:The Art of the Feast—8

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英语听力：自然百科 真实的庞贝—9

The melting rock is forcing its way out. In fact, its effects are felt years before. The city lives through something which today would be seen as a terrible warning. This is evidence of a major disaster, an earthquake that hit the city in 62 A. D.,

英语听力：自然百科 真实的庞贝—10

So this is how it begins. The 17 years between the earthquake and the final eruption are, on a geological scale, just a blink of an eye. But in the world in which the Romans live, a natural disaster is the action of an angry god. So instead of heedin

英语听力：自然百科 真实的庞贝—11

Whatever it was, it was clearly something of value. At the entrance, slots in the stone indicate the doors could be barred. There are also two guard houses inside. This was one of the most secured buildings in the city. It appears that the merchandis

英语听力：自然百科 真实的庞贝—12

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

英语听力：自然百科 真实的庞贝—13

In the main part of the building, it's striking how open and visible everything is. If you want to find where the slaves are, where the people who do the real work, you've got to go around the corner to the invisible beats and know no eye wants to co

英语听力：自然百科 真实的庞贝—14

And what sort of building were they in. Yea, we found them near a tower and they were escaping during the eruption. To the trained eye of a forensic anthropologist, the state of the bones, even 2000 years after death, is very telling. On skeleton No.