英语听力：自然百科 Farm Restoration 农场变湿地

Dale Aden has been farming most of his life, just like his father, and his fathers father. I am a third generation farmer on this land. His land is in Okabena, Minnesota, right along the Okabena creek, where for many years, Aden watched helplessly as

英语听力：自然百科 Wenchuan Earthquake 汶川大地震

On Monday, an earthquake in China measuring 7.9 on the Richter scale occurred along a fault where south Asia pushes against the Eurasian Landmass, smashing the Sichuan Plain into mountains, leading to the Tibetan highlands. In 1989, the Loma Prieta E

英语听力：自然百科 Earthquake 地震的危害

April 18, 1906, California's San Andreas Fault snaps, shaking San Francisco for nearly 60 terrifying seconds .When the trembling stops, the disaster is only beginning. Gas lines rupture, setting off massive fires, some 700 people die. Most of the cit

英语听力：自然百科 Wolf Hunting Tactics 合作至上的狼群

We are here in Yellowstone National Park to follow some grey wolves and observe the deadly brilliance of the pack. Theyve learned to cooperate, hunting their prey with many acting as one pack. This mother grizzly knows how to protect its cub and itse

英语听力：自然百科 Coral Reefs 岌岌可危的珊瑚礁

The waves of these azure seas hide an abundant treasure. Below the waves, coral reefs provide a habitat for teeming life, a life with a kaleidoscope of color. In oceans around the world, clear and well-circulating waters encourage corals to anchor an

英语听力：自然百科 Vampire Bats 恐怖的吸血蝙蝠

Here are some happy vampire bats. What's causing all this giddiness? A great, big, fat meal has arrived. You can practically hear these bats going Oh, boy! Oh, boy! Better yet, the victim is asleep. This is gonna be like, well, taking blood from a sl

英语听力：自然百科 Planetary Life After Death 浴火重生的行星

Like a phoenix rising from the ashes, astronomers have found a whole new solar system may be forming in the wake of a star's violent death. This is the Hidden Universe of the Spitzer Space Telescope, exploring the mysteries of infrared astronomy with

英语听力：自然百科 Mount Kilimanjaro 乞力马扎罗山

It is called the Roof of Africa. Rising 19,340 feet nearly 4 miles into the sky, Mount Kilimanjaro is the highest point on the entire African continent. Located in northeastern Tanzania in east Africa, Mount Kilimanjaro is about equal distant from Ca

英语听力：自然百科 Kenya's Aids Crisis 肯尼亚的艾滋病危机

This is Kibera, a slum in Nairobi, Kenya, home to about 1 million people. These children play without a care, just as it should be, but their reality is grim. They are all orphans, half of them because of AIDS. In the last five years, it has gotten w

英语听力：自然百科 Spacewalks 太空行走，看上去很美

It's morning in the Kalahari, and this female cheetah has discovered that her cubs are growing ever more independent. She calls for them, but theyve already gone out exploring. And theyve discovered a wounded gemsbok that may have escaped from a lion

英语听力：自然百科 Cheetah vs. Gemsbok 猎豹与大羚羊的角力

It's morning in the Kalahari, and this female cheetah has discovered that her cubs are growing ever more independent. She calls for them, but theyve already gone out exploring. And theyve discovered a wounded gemsbok that may have escaped from a lion

英语听力：自然百科 Fighting Fire with Fire 以火攻火 保护森林

It's been protected from human impact since 1909. With three million acres, nearly a half million under water, Superior National Forest is largely unspoiled. But now the survival of this national treasure rest with those who would see some of it burn

英语听力：自然百科 New Search For ET 寻找外星人（下）

And clearly, we are trying to find evidence of ET, and we are trying to do that by looking for a signal, in whats called the electromagnetic spectrum, which is a fancy way of saying the radio dial, at least for us. Let me turn on my radio here, okay,

英语听力：自然百科 New Search For ET 寻找外星人 上

Ok, imagine you are at the beach, in order to figure out if there are fish in the ocean, you dip an empty glass into the water and look inside. No fish in the glass? Well, there must be no fish in the ocean. Not too logical, is it? But that's exactly

英语听力：自然百科 A Cat Has Nine Lives 猫有九条命

The cat's earliest ancestors probably hunted both on the ground and in the trees. To survive, they needed not only claws, but remarkable balance, an aptitude all cats retain to this day. In keeping with its reputation, the cat usually does land on al

英语听力：自然百科 Women in Space 太空女性

Since the US space program began in 1958, NASA has achieved much in the realm of space exploration. From lunar landings to voyages into the depth of our solar system, NASA has built a storied history. In the early days, space was a men's world. All t

英语听力：自然百科 浪漫之滨里约热内卢

In Rio de Janeiro Brazil, where the mountains meet the beach, with six million residents and more than a million tourists a year, a cleanup of the beaches from past years is now a major issue. Until recently, the beach was a place for Cariocas, as Ri

英语听力：自然百科 Alternative Energy 可替代能源

When the wind picks up at the foot of the Rockies, there are those who believe they can hear the future. At the National Renewable Energy Laboratory, making alternative power sources competitive with fossil fuels has been a mission since the energy c

英语听力：自然百科 三岁女童成尼泊尔活女神

A three-year-old girl is now a new living goddess in Nepal. At a recent religious ceremony, the new Kumari or living goddess was carried from her parents' home to an ancient palatial temple in the heart of the Nepalese capital Kathmandu where she'll

英语听力：自然百科 Coastal Cleanup 净滩大行动

So, every year at this time, nearly half a million people step forward to help, to volunteer in an international coastal cleanup and the results can be staggering. In the last couple of years alone, an average of 8 million pounds of trash is collecte