英语听力：探索发现 2012-12-28 冰河新新州 Ice Age Oasis—7

But most significant of all, the jaguar has a tell-tale trademark. Instead of going for the neck or snout like most cats do, it kills with a crushing bite through the skull into the brain. This makes the jaguar prime suspect in this case. Even the gl

英语听力：探索发现 2012-12-21 冰河新新州 Ice Age Oasis—4

At first sight, manatees might look like seals or dolphins. But in fact, some of their closest relatives live on land. These toenails are the giveaway, remarkably similar to those of elephants. 13,000 years ago, two other members of the elephant fami

英语听力：探索发现 2012-12-23 冰河新新州 Ice Age Oasis—5

But the glyptodont wasn't a reptile. So what was it? There is a relative of the glyptodont thats still alive today. It's the armadillo and it's a mammal, the only mammal with this kind of armor in the whole of North America. It may give us some idea

英语听力：探索发现 2012-12-05 美洲大平原 American Serengeti—17

And all this meat in one small area attract the scavenger, the short-faced bear. Led by his super sensitive nose, his long limbs carry him many miles a day in search of carrion. He's picked up a scent, but where's the carcass? Sometimes the smaller,

英语听力：探索发现 2012-12-09 美洲大平原 American Serengeti—19

But their success hasn't gone unnoticed. From many miles away, the short-faced bear can smell blood on the breeze. He sniffs his way towards the source. Meanwhile, satisfied and sleepy, the pride settles down for a snooze. More than twice the weight

英语听力：探索发现 2013-01-16 冰河新新州 Ice Age Oasis—15

Could it be that drastic water shortage was the reason for the mastodons' epic migrations? Another big piece of this puzzle lies far out to sea. This is the ocean floor. But this isn't rock sprouting out at the bottom. It's wood. It's the remains of

英语听力：探索发现 2013-01-11 冰河新新州 Ice Age Oasis—13

But despite their name, the mighty Everglades did not exist during the ice age. So what did pre-historic Florida look like? There is one place in northern Florida that has revealed more ice age secrets than almost anywhere else, the dark slow-moving

英语听力：探索发现 2013-01-02 冰河新新州 Ice Age Oasis—9

The cold climate conifer forests of the north displaced broadleaved woodlands. Plants and animals were gradually pushed south to find a warmer climate. Florida became a refuge from the cold. Down here is where the Ice Age north met the subtropical so

英语听力：探索发现 2012-08-31 爱尔兰的故事 Story Of Ireland—21

For over 40 years, the Vikings raided Irelands coastal villages and monasteries, carrying off plunder and slaves in their long boats. They struck suddenly and caught the Irish unawares. So the Vikings became bolder and began to sail down the rivers o

英语听力：探索发现 2012-09-02 爱尔兰的故事 Story Of Ireland—22

By the 11th century, the Vikings who had settled in Ireland, the Hiberno-Norse, had been here for over a century and a half. Theyd intermarried, become Christian and formed local alliances. Theyd founded thriving port cities like Waterford, Wexford,

英语听力：探索发现 2012-09-05 爱尔兰的故事 Story Of Ireland—23

Brian did not see himself as a king among equals but as high king of all Ireland, and with a mighty army he set about trying to control the island. In the only statement of his that we know about, he describes himself as Imperator Scottorum, Emperor

英语听力：探索发现 2012-11-21 美洲大平原 American Serengeti—11

In a Colorado gully, hunters carried out a mammoth massacre, leaving behind the remains of at least 16 animals. The site recreated here contains a treasure trove of evidence relating to the mammoth's daily life. Again by comparing mammoth bones to el

英语听力：探索发现 2012-11-23 美洲大平原 American Serengeti—12

Because these two bull mammoths both had broken tusks, they could have fought at closer quarters than they would do normally. Twisting and turning, they became locked in a deadly embrace. Even more bizarre, this twist of fate then caused a third fata

英语听力：探索发现 2014-06-20 BBC 地平线：陨石的真相-17

Really, its a balance between the size of the object, its speed into the atmosphere and critically the altitude at which it explodes. Too high, if its too small and it explodes too high, the shockwave has little effect on the ground. If its quite low

英语听力：探索发现 2014-06-22 BBC 地平线：陨石的真相-18

Down on the ground, the scale of impact is even more breathtaking.The crater is more than 1000 meters across and nearly 200 meters deep.The forces here were enoumous.The impact on this solid rock into this pulverized mochi,just bustled in your hand.Y

英语听力：探索发现 2014-06-27 BBC 地平线：陨石的真相-20

Oh, perfect, perfect, perfect. Now were seeing the fireball come in, its brighter than the Sun and then, Kapow, it hits the surface. Jeez! This whole region, downrange, would have been incinerated. It would have been incinerated just by this plasma,

英语听力：探索发现 2014-01-26 America's Sex Pioneers 美国的性爱先锋-2

But America's sex pioneers are limited to the bedroom, because there is nothing like sex to bring up the American can do spirit. But you're to be surprised to discover just to the first America's sex pioneers were no other than the straight l* Purita

英语听力：探索发现 2013-01-25 冰河新新州 Ice Age Oasis—19

In the heat of the day, hunters can afford to slow down and rest in the shade. Its one of the advantages of a high-protein diet. Llamas originated here in North America are the regular visitors to the spring. The strange-looking tapir is common too.

英语听力：探索发现 2013-02-15 猛玛象进城记 Mammoths to Manhattan—8

Just over 500 years ago, Europeans arrived in North America. And with these colonizers came an animal that hadnt been seen here for thousands of years. The horse returned to the Americas, now tamed and carrying the Spanish conquistadors. This new for

英语听力：探索发现 2013-03-08 猛玛象进城记 Mammoths to Manhattan—17

But there is at least one place in Florida where the manatees benefit from humans being around. Clean, hot water released from this power plant turns a man-made inlet into a hot tub. And during winter months when sea temperatures drop below 20 degree