英语听力：自然百科 圣河之旅 The Nile尼罗河—14

This is Arerwoha, arebit for the awaisis. It's a twenty two thousand acre state in their farm that uses more than 8 million Gallons water from the Nile every day. It's a model that manager A thinks could be replicated along the link for the river. Lo

英语听力：自然百科 圣河之旅 The Nile尼罗河—12

A colonial area treaty drawn up by the British awarded Egypt the rights to 66 percent of the river's entire flow. Ethiopia, where the majority of the water in the Nile originates got none. -We are hugely remote part of the plan here, but make no mist

英语听力：自然百科 圣河之旅 The Nile尼罗河—11

On this way through the Ethiopia highlands the Nile cuts its way through a canine at times three hundred deep and more than two hundred fifty miles long. Remote and infestite with crocodiles and Malyry mosquitoes. The Nile has long flow through this

英语听力：自然百科 圣河之旅 The Nile尼罗河—10

Outside the monks were giving thanks for the waters of the Nile. Here in Ethiopia we feel the water represents life to human beings. If man doesn't have water, he has to endue drought. The river Nile making its way around Ethiopia nutritious the coun

英语听力：自然百科 圣河之旅 The Nile尼罗河—13

Officials here say this dam will help to lift the country out of poverty. Its a persuasive argument, but economic development here as it does everywhere, comes at a moral and ethic cost. Behind the dam, a vast track of wilderness will be submerged un

英语听力：自然百科 为何婴儿大多拥有蓝色眼睛？

Hi, its Kasey-Dee Gardner for Why? Tell Me Why? This week we received a question about baby eye color. The question was why are most babies born with blue eyes?. And I wasnt sure that was a true statement, but it is in fact a true statement. Actually

英语听力：自然百科 行星旅行指南：木星 Jupiter—5

Halfway there, you bump into the Asteroid Belt. It is not like in the movies where you are dodging asteroids at every second. It is a The space is very big and the asteroids are a long distance apart, so you could travel through it quite safely. The

英语听力：自然百科 行星旅行指南：木星 Jupiter—9

This could be the most terrifying sight in the solar system: clear skies above a bottomless pit, an infernal drop into the depth of Jupiters endless sky. You may have raindrops evaporating into the hot interiors of Jupiter, but there is no ocean down

英语听力：自然百科 行星旅行指南：木星 Jupiter—8

Picture a suicide dive into the mysterious depth? Relax, Galileo's already done it for you. We separated the probe from the Galileo mother ship. We were flying in toward Jupiter, basically a ballistic bullet. The Galileo probe went in at an unbelieva

英语听力：自然百科 行星旅行指南：木星 Jupiter—7

If you are floating in a balloon, the center of the red spot might be rather calm. But you will be going fast, your balloon will be going faster than the hurricane winds, but it might be a smooth ride. This storm is a sigh to the halt, towering five

英语听力：自然百科 行星旅行指南：木星 Jupiter—6

When the space hardened Voyagers I and II flew past in 1979 on their way to the outer solar system, Jupiters great mysteries only deepened. How were these powerful magnetic storms generated inside a giant ball of gas? Why was one moon boiling with vo

英语听力：自然百科 行星旅行指南：木星 Jupiter—4

Jupiter is a planet that knows how to exert its influence on the solar system, and how to impress even the season traveler. You can fly around the earth in a jumbo jet in less than two days. Try this on Jumbo Jupiter and youll be in the air for three

英语听力：自然百科 行星旅行指南：木星 Jupiter—3

This giant gas bag is built from the flimsiest materials in the universe. But for all its squishy bulk, its a great little mover. Jupiter spins at such a breakneck speed that it bulges at the equator, so fast in fact that a day here lasts less than t

英语听力：自然百科 行星旅行指南：木星 Jupiter—2

Oh, man, thats incredible!.... A tour of the solar system wouldnt be complete without a visit to its largest planet, but with the grandest sights, biggest dangers and greatest mysteries all on the itinerary, it pays to brush up before blast off. Cons

英语听力：自然百科 行星旅行指南：木星 Jupiter—1

Life feeling a bit ordinary? Travel choices a bit tame? Head beyond the asteroid belt for an out-of-this-world experience. Welcome to Jupiter, home of high-adrenaline adventure. Plunge into its mysterious depth. You drop through the clouds, it would

英语听力：自然百科 太阳能

The most powerful source of energy on the planet is actually out in space. It's our sun. More energy falls as sunlight on the US in a single day than it uses in a year. But it's been difficult to turn that sunlight into electricity. Many of us alread

英语听力：自然百科 罗斯福国家公园

On the northern prairie of North Dakota, the day starts with a distinctive rhythm. Bison prepare for the mating season. The bulls bellow challenges that echo across the badlands. Prairie dogs bark shrill warnings at the approach of an intruder. You w

英语听力：自然百科 黄石公园的夏天 Yellowstone—10

As soon as she feels it is safe, she settles to suckle and reassure them. Bison can shrug off this sudden change in the weather; they are after all built to survive the Yellowstone winter. But this tiny hummingbird is more vulnerable. Flowers damaged

英语听力：自然百科 黄石公园的夏天 Yellowstone—9

This pack seem prepared to allow their young a brief foray to experience the world beyond their den. But his high-octane lifestyle critically depends on the summer sun. And in Yellowstone, that's never a guarantee. In the mountains surrounding the pl

英语听力：自然百科 黄石公园的夏天 Yellowstone—7

Hot water scorches and drowns the roots of trees encroaching on the valleys. It can keep the forests in check and the rich pastures / open. Those pastures now produce the new grass needed to make rich milk and feed a bison baby boom. The few calves b