英语听力：2013-06-26 《恐龙的战争》3 顽强防御—5

Here we have one of the greatest predators nature has ever produced and one of the greatest defenders nature has ever produced sparring of with some truly awesome weaponry. Theres nothing like that in the world today. Triceratops most effective defen

英语听力：2013-06-23 《恐龙的战争》3 顽强防御—4

Sometimes they even take on members of their own specie in a battle for dominance. Its primary weapon is a pair of a-meter-long horns mounted on its skull. These horns make those of modern creatures look lightweight. A rhinos horn is made of hair, an

英语听力：2013-06-21 《恐龙的战争》3 顽强防御—3

Triceratops is an amazing animal simply because it was absolutely enormous. They had this big massive body with a big gut. So, you know, we are talking of an animal thats maybe four or five tons. A Triceratops is half as tall as a T-Rex, yet it weigh

英语听力：2013-06-19 《恐龙的战争》3 顽强防御—2

These plant eaters are no pushovers. They are no theyre no pansies. We have records, quite a few, of adult dinosaurian predators being killed by herbivores. It did happen. It happens today. Lions get kicked in the face and die from a single blow from

英语听力：2013-07-05 《恐龙的战争》3 顽强防御—9

The tip is designed not the split on impact. It absorbs the stress of all that raw power the hammer gives because its not solid bone. Instead, its honeycombed with soft tissue, marrow, blood and fact. Ankylosaurus combines steel-like protective plate

英语听力：2013-05-17 完美捕食 Perfect Predators —7

Attacking another T-Rex may seem like suicide, but a creature with such a voracious appetite has to find food by any means. Cannibalism is the rule. Its not the exception. If youre a carnivore and theres meat there, you take advantage of it. In fact,

英语听力：2013-06-02 完美捕食 Perfect Predators —14

propel this creature weighing as much as a grizzly bear, from a dead stop to a launch speed of 50 kilometers per hour all in a fraction of a second. I think that seeing a pterosaur like Quetzalcoatlus actually take off would have to be one of the mos

英语听力：2013-05-31 完美捕食 Perfect Predators —13

Picture a living plane, and that gives you a sense of what Quetzalcoatlus would look like in life. And this is an animal that probably accelerates over 2.5Gs just on takeoff. Just beyond our comprehension. A Quetzalcoatlus is 10 times the weight of t

英语听力：2013-05-29 完美捕食 Perfect Predators —12

Deinonychus instinctively knows to go for this giants weak spot, its neck. Youve got the windpipe there. Youve got the jugular vein, which if opened up will mean that that Sauroposeidon is dead meat. But death does not come quickly or pleasantly. For

英语听力：2013-05-26 完美捕食 Perfect Predators —11

They are actually increasing their chance of getting a meal. Its a strategy still used today. Working together, lions will take on prey as big as a four-ton elephant, and they only have teeth and claws. Deinonychus employs an array of weaponry more p

英语听力：2013-05-24 完美捕食 Perfect Predators —10

These Olympic capabilities come down to one simple anatomical feature, its tail. Half the length of its body, it acts like a built-in counterbalance. By flicking it from side to side, it can make a sharp turn at full speed. If you were to look at Dei

英语听力：2013-05-22 完美捕食 Perfect Predators —9

And Sauroposeidon like most plant eaters are smelly. Unlike a meat eater, they produce huge amounts of waste, feces that form a trail marking everywhere theyve been. For Deinonychus, that odor is a dead giveaway. And this carnivores eyes can clearly

英语听力：2013-05-19 完美捕食 Perfect Predators —8

Sauroposeidon towers over Deinonychus. In fact, its mammoth size is its primary defense. But this giant begins life very small. For Deinonychus, Sauroposeiden would be a great meal, at least the juveniles, because there wouldve been lots of them and

英语听力：2013-05-12 完美捕食 Perfect Predators —5

Hearing, smell and sight are all well refined. We can look at the sense of vision and see the attributes of a predator. T-Rexs eyes are 40 centimetres apart providing exceptional binocular vision, the ability to perceive depth. An eye is essentially

英语听力：2013-05-10 完美捕食 Perfect Predators —4

Its unlike any other creature that has walked the planet. T-Rex is different. Something about Tyrannosaurs and Tyrannosaurus Rex itself is different than other predatory dinosaurs. But for such a celebrated killer able to take on the toughest creatur

英语听力：2013-05-08 完美捕食 Perfect Predators —3

Triceratops protects itself with a bony shield called a frill. They can fend off an attacker with a pair of one-meter-long swords. Youve got to crush it. The only way to deal with this huge, curved, cantilevered, composite armor is a crushing blow wi

英语听力：2013-05-05 完美捕食 Perfect Predators —2

The jaws of T-Rex are infamous and lethal, housing sixty teeth with some as long as 30 centimeters. Its skull is constructed of 64 bones designed to be light but strong. Its 16 times stronger than the jaws of an alligator. The front teeth are dagger-

英语听力：2013-05-03 完美捕食 Perfect Predators —1

Tyrannosaurus Rex was of ten thousand pound, self-propelled, antitank weapon. Now, sixty five million years later, cutting-edge imaging technology lets us look deep inside their bodies to reveal just how the worlds greatest carnivores really work. Di

英语听力：2013-05-01 恐龙之战之极限生存 Extreme Survivors—19

Dinosaurs ruled the earth for millions of years. They grew to almost unimaginable sizes,nd adapted to extreme environments all over the globe. These animals were very successful and really, some of the crowning achievements of evolution. And they do

英语听力：2013-05-15 完美捕食 Perfect Predators —6

Thats what it wants to hear, because that sound is gonna mean thats where lunch is. A battle with Triceratops is more often than not a fight to the death. This herbivore has evolved into a tank. Now, as a Tyrannosaur specialist, I dont like to admit