英语听力：2013-07-31 《恐龙的战争》3 顽强防御—20

Probably the only way a T-Rex could successfully and safely bring down Triceratops is by having at least one other individual Tyrannosaur that would ambush it from the back while the one in front is keeping the attention of the Triceratops. Working a

英语听力：2013-07-28 《恐龙的战争》3 顽强防御—19

populated by millions of odor receptors. Complicated, crazy-straw, tortuous nasal passageway that went from the nostrils, made several loops through the snout before it went down into the throat. Ankylosaurus supersensitive nose can pick up a carnivo

英语听力：2013-07-26 《恐龙的战争》3 顽强防御—18

They couldnt see directly behind themselves, and they actually would have problems seeing directly in front of themselves. Its almost a different visual world than one that we can imagine. The Parasaurolophus have a solution to this problem. When you

英语听力：2013-07-24 《恐龙的战争》3 顽强防御—17

Individually, their huge size is a powerful defense, but sticking together makes these Leviathans almost indestructible. Keeping a herd of 50-ton animals filled up, however, means traveling vast distances, grazing territory covering thousands of squa

英语听力：2013-07-19 《恐龙的战争》3 顽强防御—15

This tactic is still used today on the plains of Africa. If you look at various species of plant eaters, they live together in groups, and if one of them spots a predator, they can whinny or hoot and let the rest of the herd know, so that they can ke

英语听力：2013-07-17 《恐龙的战争》3 顽强防御—14

and interpreting sounds. Its called the auditory cortex. What was a surprise is the higher centers of their brain are very large and suggest that something very different is going on in Parasaurolophus and its kin than in most other of these plant-ea

英语听力：2013-07-14 《恐龙的战争》3 顽强防御—13

the equivalent of a human being with a brain the size of a pea. Lobes for both sight and smell are tiny. Areas controlling information analysis, learning, and complex thought are barely developed. If you look at the size of their brain, you actually

英语听力：2013-07-12 《恐龙的战争》3 顽强防御—12

...plant material at a time, and were talking about something huge. Surprisingly, it isnt something huge which allows these giant herbivores to grow big enough to be all but invincible. In fact, its something incredibly small, and something meat eate

英语听力：2013-07-10 《恐龙的战争》3 顽强防御—11

The number-one concern in life would befeeding the beast. The land is covered in vast forests offerns, pines, and monkey puzzle trees. Many of these plants have almost nonutritional valuel. The hardest job in the animal world, thedinosaur world, was

英语听力：2013-07-21 《恐龙的战争》3 顽强防御—16

Thats a wave of energy that could knock over a predator or at least discombobulate it, scramble its brains. Despite holding a deafening secret weapon, a Parasaurolophus, like other plant eaters, knows that the best way to stay alive is to keep predat

英语听力：2013-10-20 地平线：黑洞吞噬—14

Instead, it seems to be a gas cloud moving at huge speeds right in the direction of the black hole. But what really rang along bells was the way it had changed shape. We see that this gas cloud as it moves closer and closer to the black hole, is gett

英语听力：2013-09-15 《流言终结者》 第11季 第8集 完全爆炸手册—20

I call this piece Explosion 753. From A for audit to Y for yelling and everything in between, the Mythbusters A to Z of explosions has been a blast. And with just one letter left, you might say that the guys are going to end with a bang. Well if X is

英语听力：2013-10-13 地平线：黑洞吞噬—11

Just as I arrived at UCLA with my first faculty position, everything was falling into place in terms of the ability to answer this question at the centre of our galaxy. The telescopes were getting bigger so you had the due ability to see fine details

英语听力：2013-10-16 地平线：黑洞吞噬—12

If there's a black hole at the center of our galaxy, that's gonna force these objects that are really close to the black hole to move much faster than they would move if there were no black holes. So the first thing you wanted to see is there are ver

英语听力：2013-10-18 地平线：黑洞吞噬—13

It was a stunning discovery. After a quest lasting decade, Donald Lynden-Bell had been proved right. Here indeed, just where he had predicted, was a super massive black hole. But in the last year, the quest to find and understand black holes has sudd

英语听力：2013-11-22 地平线：什么害死了我们的蜜蜂—1

This summer, I set out to get to the bottom of a story thats captured the headlines. And this one, Ive got some experience myself, because Im also a beekeeper. There, is that good? Yeah, its perfect. Ok, I hate squeezing like that. I met some scienti

英语听力：2013-11-20 地平线：黑洞吞噬—27

If you look at the Milky Way galaxy, its this interesting balancepoint that this place where its just enough to wash from the black whole tokeep things interesting to possibly make the environment that allows us toexist here. Astronomers are eagerly

英语听力：2013-11-17 地平线：黑洞吞噬—26

To walkhere on Earth, to be alive, it thanks to a long chain of cause and effect writtendeep into the structure of the universe. A primordial process so long, and soancient that on the scale of a human life it seems almost incomprehensible. One of th

英语听力：2013-11-15 地平线：黑洞吞噬—25

Galaxies could in a way, be much bigger than they currently are. Something is stopping them growing larger and that something is the black hole at the center. Now this is bizarre because the ration of the size of the black hole to the size of the gal

英语听力：2013-11-10 地平线：黑洞吞噬—23

There was now a pressing challenge to understand how black holes in their surrounding galaxies. To be so intertwined.，professor Andy Fabian in the Cambridge University is one astronomer who began to look. Like the ripples, they travel out from his