英语听力：2012-02-12 从南极到北极 From Pole To Pole—12

The strike of a great white shark lasts a mere second. Slowing it down forty times reveals the technique and immense strength of this massive predator. If surprise fails, there will be a chase. The shark is faster on a straight course, but it cant tu

英语听力：2012-02-10 从南极到北极 From Pole To Pole—11

The female retires to consider her verdict. Its hard not to feel deflated when even your best isnt good enough. The sun influences the lives in the ocean just as it does on land. Its richest parts are those where waves and currents bring fertilizing

英语听力：2012-02-08 从南极到北极 From Pole To Pole—10

The character of the forest changes as we descend, becoming ever darker and damper, favoring different kinds of animals and plants. Less than two percent of the sunlight reaches the floor. But even here there is extraordinary variety. In the Great Is

英语听力：2012-02-05 从南极到北极 From Pole To Pole—9

The advance of the seasons brings constant change. As the suns influence diminishes in the north, so the deciduous forests of America begin to shut down, losing their leaves in preparation for the dark, cold months ahead. One season hands over to ano

英语听力：2012-02-01 从南极到北极 From Pole To Pole—7

As we travel south, so the suns influence grows stronger. And at 50 degrees of latitude, a radical transformation begins. Summers here are long enough for broadleaf trees to replace conifers. Broadleaves are easier to eat and digest, so now animals c

英语听力：2012-01-29 从南极到北极 From Pole To Pole—6

Midsummer on the tundra and the sun does not set. At these altitudes, the suns rays are glancing and not enough of their energy reaches the ground to enable trees to grow. Youll need to travel five hundred miles south from here before that is possibl

英语听力：2012-01-25 从南极到北极 From Pole To Pole—4

Day 10. And the mother has let her cubs a mile from the den. Its time to put them to the test. Theyve grown enormously in confidence, but they dont have their mothers sense of urgency. At last it seems that they are ready for their journey. And they

英语听力：2012-01-22 从南极到北极 From Pole To Pole—3

But they are hungry and eager to reach their mother whos delayed feeding them on this special day. Now she lures them with the promise of milk, the only food the cubs have known since they were born, deaf and blind beneath the snow some two months ag

英语听力：2012-01-27 从南极到北极 From Pole To Pole—5

They are constantly on the move. New-born calves have to be up and running the day they are born. But the vast herds do not travel alone. Wolves. Packs of them, eight to ten strong, shadow the migration. And they are hungry. Its the newly born calves

2015-10-21 History Channel:西恩宾回顾滑铁卢战役-2

My Waterloo advanture begins in C* in the southeast of England. These history enthusiasts rehearsing for huge reenactments of the battle some a*'s 200 anniversary. Some have ancestors who were there. When the French army of Napoleon Bonaparte's looke

2015-03-20 BBC:星光七纪元-18

Now the Sun will be burning hydrogen as the stars doing in the main sequence until the hydrogen is exhausted in the core, and at that point the stars start to die, the outer layer of the Sun will expand, the Sun will move away from the main sequence

2015-03-13 BBC:星光七纪元-16

Energy isn't created or destroyed,it's transferred, so it's transferred from the center of the Sun through the atmospheres to us in many forms, warmth and light via the plants and via the food that we eat. I can really understand why ancient civiliza

2015-02-27 BBC:星光七纪元-12

What most of us have learnt is that the Sun's reliable, dependable, unchanging, but its serene outward appearance that we take for granted belies a truth about all middle age stars, beneath the surface, there is a battle raging, uncovered by the scie

2015-03-11 BBC:星光七纪元-15

But the sun's violent burst can harm us, its active nature is what allows us to live at all, because the sun also eject the solar wind, and energized stream of particles that head out into space, and that we can see passing-off as it bounces off our

英语听力：2012-01-20 从南极到北极 From Pole To Pole—2

The penguins stay when all other creatures have fled because each guards a treasurea single egg rested on the top of its feet and kept warm beneath the downy bulge of its stomach. There is no food and no water for them. And they will not see the sun

探索发现：BBC:古代圣贤:佛祖释迦牟尼 Buddha-13

BBC: Genius of the Ancient World | 《英国广播公司：古代世界的天才》 第一集 Buddha 古代圣贤：佛祖释迦牟尼 历史学家贝特妮休斯（Bettany Hughes）游历印度、希腊、和中国以追寻三位古代世界的哲学巨

探索发现：BBC:古代圣贤:佛祖释迦牟尼 Buddha-33

BBC: Genius of the Ancient World | 《英国广播公司：古代世界的天才》 第一集 Buddha 古代圣贤：佛祖释迦牟尼 历史学家贝特妮休斯（Bettany Hughes）游历印度、希腊、和中国以追寻三位古代世界的哲学巨

探索发现：BBC:古代圣贤:佛祖释迦牟尼 Buddha-32

BBC: Genius of the Ancient World | 《英国广播公司：古代世界的天才》 第一集 Buddha 古代圣贤：佛祖释迦牟尼 历史学家贝特妮休斯（Bettany Hughes）游历印度、希腊、和中国以追寻三位古代世界的哲学巨

探索发现：BBC:古代圣贤:佛祖释迦牟尼 Buddha-31

BBC: Genius of the Ancient World | 《英国广播公司：古代世界的天才》 第一集 Buddha 古代圣贤：佛祖释迦牟尼 历史学家贝特妮休斯（Bettany Hughes）游历印度、希腊、和中国以追寻三位古代世界的哲学巨

探索发现：BBC:古代圣贤:佛祖释迦牟尼 Buddha-30

BBC: Genius of the Ancient World | 《英国广播公司：古代世界的天才》 第一集 Buddha 古代圣贤：佛祖释迦牟尼 历史学家贝特妮休斯（Bettany Hughes）游历印度、希腊、和中国以追寻三位古代世界的哲学巨