英语听力：自然百科 Fuel Cell 聚焦燃料电池

For something that could revolutionize the world, its come along very slowly. The fuel cell was invented in 1839, but there was little development until the 1950s when NASA started to use them in space where they are still used today. Now, after year

英语听力：自然百科 New View on Stonehenge Burials 巨石阵新解

The tantalizing mysteries of Stonehenge may have come one step closer toward being solved. New radiocarbon dates of human cremation burials there indicate that Stonehenge was used as a cemetery from its inception just after 3,000 BC until well after

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 澳大利亚或立法禁爬艾尔斯岩

Visitors are flocking to Australia's most famous natural landmark so they can climb it while they're still allowed to. Some consider this giant sunburned rock the very heart and soul of Australia. Europeans called it Ayers Rock. To indigenous Austral

英语听力：自然百科 好心的黑猩猩

Japanese researchers claimed that chimpanzees are capable of human-like altruism. Kyoto Universitys Primate Research Institute published their findings in the scientific and medical research journal Plus One. Twelve chimpanzees were used in the exper