英语听力：自然百科 鲨鱼湾的海豚—7

Puck needs to watch out.As she searches in the sea grass,she will be unaware of any shark approaching.If a tiger shark closes form behind,her sonar can not detect it.Distracted,Puck could be easily attacked.Once detected,Puck can easily out swim the

英语听力：自然百科 鲨鱼湾的海豚—6

Here's Puck right here with India. He just stroked her along the side. Right now, Puck seems to be very tolerant of India. I don't know if that will happen when the baby is born, and she might really have to push India out of the way. Puck can't supp

英语听力：自然百科 鲨鱼湾的海豚—5

It's high risk in this shallow water, India could easily strand. I saw India catch a big one and he's a good hunter. Everything the Beachies do is recorded in minute detail. Across Shark Bay, Janet's research team follow different families of dolphin

英语听力：自然百科 鲨鱼湾的海豚—4

Puck's baby is dangerously late,over the next month,tiger shakes numbers will increase tenfold,as they head south to their hunting ground in the bay.For Puck's calf to stand the best chance of survival,she needs to have it soon. New born are easy pre

英语听力：自然百科 鲨鱼湾的海豚—3

She's already lost four babies, at least one to sharks. This new calf would be especially precious. Very little is known about the first days of a calf's life. It's a rare opportunity for Janet to learn more. They are all very close, and they just so

英语听力：自然百科 鲨鱼湾的海豚—2

The world heritage site,its enormous seagrass beds carpet the shallows, creating one of the richest marine environments on earth. Several hundred families of bottlenose dolphins live here, and one of the largest is called the Beachies. Puck began her

英语听力：自然百科 鲨鱼湾的海豚—1

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英语听力：自然百科 冰冻星球 前往地球尽头—16

The seal is now what the killer wanted, but the hunt is far from over. They need to wrap their prey by the tail while avoiding its snapping jaws. Only them will they be able to pull it down and drown it. Side swipes create farther underwater turbulen

英语听力：自然百科 冰冻星球 前往地球尽头—17

Exhausted, it no longer has the energy to pull itself to safety. And the killers are moving in. Game over. Although such team hunts are rarely seen, scientists believe they may be the most complex ever documented in the natural world. They were first

英语听力：自然百科 冰冻星球 前往地球尽头—15

The randoms of the sea ice are occupied by sun- bathing seals that have been here all winter. But the new arrivals're following the retreating ice edge and they have come here to hunt. Killer whales, the oceans' top predator. Killers are like wolves,

英语听力：自然百科 冰冻星球 前往地球尽头—14

Every summer over 40 million penguins take to the southern ocean to feed. They're joined by thousands of whales，minks are the most numerous. They all come here to harvest the richest ocean on earth. Carrying on south, we have our first glimpse of t

英语听力：自然百科 冰冻星球 前往地球尽头—18

The relative of the woodlouse is the size of dinner plate. And this so- called sea spider has legs that expand half a meter. Now it's explorer's own revealing other worlds that lie hidden beneath the ice on land. These smoking tars are the gateway to

英语听力：自然百科 徒步南非之德拉肯斯堡山脉 The Drakensberg—14

elusive peak. -Come on. Let's get one last view. Well, that last gravel was worth it. -It was. -So what about 2,500 meters up here which is about 8000 feet？What's this summit called? －Doesn't have a name. -Doesn't have a name? -No. Doesn't have a

英语听力：自然百科 徒步南非之德拉肯斯堡山脉 The Drakensberg—13

This is the halfway point of my walk today. It's been three hours since I started it out, some ideal spot for rest. I'm finally in the upper Berg.-So this is where people do in origins. -Yes. -Now I wish it's today though. I've come to realize this i

英语听力：自然百科 徒步南非之德拉肯斯堡山脉 The Drakensberg—12

-Oh Julia,take a good look on the moutain.This is the last time you gonna see a full view of Cathedral Peak up until we get very close to it.And the best.So enjoy it.-How can you not enjoy it.-Enjoy it.Take it all in.-Nice cool bit of cloud. There's

英语听力：自然百科 徒步南非之德拉肯斯堡山脉 The Drakensberg—11

An unexpected break in the weather means I am able to make one more stab at the summit. -It's difficult to believe this is the same spot as yesterday without the rain. You can actually see. And look at that vista! With the spring back into my stab, t

英语听力：自然百科 徒步南非之德拉肯斯堡山脉 The Drakensberg—9

Day two, and rather worryingly, the weather doesnt seem to be improving. It also requires a painfully early start. Its an 18-kilometer round trip from the hotel to the summit, which most hikers tackle in one go, averaging eight to nine hours of stead

英语听力：自然百科 徒步南非之德拉肯斯堡山脉 The Drakensberg—8

It was a very thought of wandering these mountains that first attracted Brian. He's remained a firm fan even since. He's even written a book about the hotel's history and his experience here.-It's so different from anything else you can find anywhere

英语听力：自然百科 徒步南非之德拉肯斯堡山脉 The Drakensberg—7

For the Bushmen, it was this animal approaching that landed them in serious trouble. Zulu farmers chased the San further and further into the higher mountains, eventually pushing them out of the Drakensberg all together. -It is amazing to think that

英语听力：自然百科 徒步南非之德拉肯斯堡山脉 The Drakensberg—6

Ok, Jules, I didnt make you walk all this way for nothing. Good. Ah these! So cave paintings. Yes, yes. These are San paintings. You may know them as Bushmen. The San Bushmen. Yes. Youre looking at basically the history of Drakensberg and we call it