英语听力：自然百科 美国-史密斯岛

Smith Island is a lonely outpost, 12 miles out in the lower Chesapeake Bay. The shallow glassy waters around the cluster of islands that comprise Smith Island are some of the best blue crab habitat in the bay. For more than 300 years the people here

英语听力：自然百科 海洋“死亡地带”

Oceanographer Jack Barth has had plenty of bumpy rides off the Oregon coast, launching and retrieving these underwater gliders. From April to October, they gathered data to help answer questions about the hell of the world's oceans. Alright, buddy, w

英语听力：自然百科 神奇水世界 Water-15

They could not lose. Resistance movements started. They would take over places like this and opened the sluice gate allowing the water to pour back down into Owens Valley. Irregularly they dynamited the aqueduct. But the city rebuilt it and the game

英语听力：自然百科 神奇水世界 Water-9

But the human's struggle to pin down water is forever balanced on a knife edge. Get that balance wrong, and you pay the price. For all their ingenuity, the Garamantes over-exploited their ground water. Eventually, it ran out, and so did their civiliz

英语听力：自然百科 神奇水世界 Water-10

The key was adaptation. Rain. A familiar occurrence in many parts of the world. But this is rain at its most extreme, the monsoon. The significance of the monsoon isn't the human discomfort, but how the people here have learned to live with it. I'm t

英语听力：自然百科 神奇水世界 Water-11

It's just magic. When you follow it, you can see that this is the perfect union of the tree and the villages. The locals have kind of trained the roots, kind of guided them through and netted them together. What they've done here is they've grabbed s

英语听力：自然百科 神奇水世界 Water-12

And this was their greatest achievement: the legendary temple complex of Angkor. You know, a real sense of age of this place here. This was built over 1,200 years ago. At a few places right here you can see a show of the age that faces are all worn,

英语听力：自然百科 神奇水世界 Water-13

But as it grew, the Khmer Kingdom faced the stumbling block. When the monsoon finished each year, the fish and water would vanish. So each year, the inhabitants were plunged into drought and hunger. The Khmer rules off the challenge magnificently. Th

英语听力：自然百科 神奇水世界 Water-14

Today we take our control of water for granted. Modern civilization couldn't exist without it. But there is still only a finite amount of water to go around. In many parts of the world, scarcity has led to a bitter struggle for control over the avail

英语听力：自然百科 神秘百慕大 bermuda triangle—7

Some believe that massive underwater landslides or earthquakes can violently release gas from a substance called methane hydrate trapped beneath the sea bed. As its escaping bubbles rise, they lower the density of the surrounding ocean. The ship drop

英语听力：自然百科 神秘百慕大 bermuda triangle—6

Of course, we're always hopeful that we can find the Holy Grail of the Bermuda Triangle search which is 'Flight 19'. But, but any plane that we can locate is a jigsaw piece of the puzzle of the mystery of the Bermuda Triangle. Deep in the heart of th

英语听力：自然百科 神秘百慕大 bermuda triangle—5

Its two passengers are conducting an investigation into what they call electronic fog, a vapor that they think causes disappearances within the Triangle. Pilot Bruce Gernon needs to land the aircraft as soon as possible. The plane touches down safely

英语听力：自然百科 神秘百慕大 bermuda triangle—4

Pierce thinks this powerful charge can electrify clouds in the lower atmosphere and create this supposed electronic fog. As this additional energy comes into the storm activity, it ionizes the air wall and this generates, quote, the electronic fog. A

英语听力：自然百科 神秘百慕大 bermuda triangle—3

Gerrallan needs to escape the fast-developing cloud in order to survive. The tunnel was rapidly getting stronger, and it was a little lower at ten thousand feet to the center of the tunnel so we aimed for that opening and started descending down at f

英语听力：自然百科 神秘百慕大 bermuda triangle—2

In 1945, five Avenger torpedo bombers left from Fort Lauderdaleon a training mission, and they flew off into oblivion. We'regoing to fly east. We're flying too far north. We think we're 225 miles east of base. Their names would go down in history as

英语听力：自然百科 神秘百慕大 bermuda triangle—1

In our world of scientific discovery, one mystery endures. The Hoodoo Sea, the Limbo of The Lost, some seeing mysterious forces at work, others the powers of sea and storm. We dive into the deep. It appears to be a large military plane. And unleash s

英语听力：自然百科 神秘百慕大 bermuda triangle—8

There's no doubt that a stream of giant bubbles could theoretically have sunk the U.S.S.'Cyclops'. Whether the bubbles were there or not, that's not for us to say. But I'll leave that up to the oceanographers. But could methane gas also explain the d

英语听力：自然百科 神秘百慕大 bermuda triangle—16

Unfortunately, the two airplanes were extremely similar, and even up till nowadays, they are still flying these airplanes, and there were literally thousands of these airplanes made. Greg Littles hunch that this could be the ill-fated 1948 airliner m

英语听力：自然百科 已知的宇宙：外星生命 Alien_Contact-4

Water allows the sand grains to flow to gather and intermingle and form more complex structures. In the same way, water acts like a cocktail mixer, allowing the atoms and molecules to come together, and also may form the building blocks of life. All

英语听力：自然百科 已知的宇宙：外星生命 Alien_Contact-3

Those planets are all going to be so hot, and you cant develop something as complex as life. Scientists have gone back to the drawing board, looking to find worlds capable of supporting life, small rocky planets like earth. We dont know that life has