英语听力：自然百科 行星旅行指南：火星 Mars—15

If we have been wet, then we want to look for nutrients and food sources that could support microbes. The water ice is proof of a valuable resource for any life forms still clinging(附着) beneath the surface and for future travelers. We now know th

英语听力：自然百科 行星旅行指南：火星 Mars—18

There is no room to screw up on a trip like this, mental or otherwise. Once on Mars, you are likely to be stuck there for a year or more, waiting for a window of opportunity to ride home. And unlike a robot, the hopes and fears of the whole planet wi

英语听力：自然百科 行星旅行：土星 Saturn—1

No planet beats Saturn for jaw-dropping beauty. Saturn is the most photogenic planet in all the solar system. Some of the pictures are to die for. But the postcards only tell part of the story. Beauty is only skin deep. It really is rolling and seeth

英语听力：自然百科 行星旅行指南：火星 Mars—2

Its been said that the first person on Mars is alive somewhere on earth today. Imagine its you. What do you need to know? How much you get there? What should you pack? What are some of the must-see sights and what should you avoid? Think of this as y

英语听力：自然百科 行星旅行指南：火星 Mars—1

Have you ever fantasized about going somewhere special? Somewhere far from crowds, off the beaten track. Somewhere out of this world? Is it time to catch a rocket to the Red Planet? Mars is filled with mysteries, Volcanoes 75,000 feet tall, huge cany

英语听力：自然百科 行星旅行指南：火星 Mars—3

Could life have been forged in the same way on both planets? When we sent the first probe to investigate in the 1960s, almost anything was possible. Originally in the popular imagination we thought that Mars might be inhabited by whole civilizations,

英语听力：自然百科 行星旅行指南：火星 Mars—4

Therere some basic things you should know about Mars before leaving home. Most days will be clear, and sunny and cold. The average temperature on Mars is as bitter as midwinter in Antarctica. And about half the diameter of the earth, Mars is a handy

英语听力：自然百科 行星旅行指南：火星 Mars—5

In the four decades since our robots first arrived, the once fuzzy ball at the end of our telescopes has steadily focused into a red planet we can understand, and it is not a welcoming place. The problem is the atmosphere is so thin and cold that wat

英语听力：自然百科 行星旅行指南：火星 Mars—6

Steve Squyres Martian odyssey has taken him from pole to pole, visiting those places on earth that share at least some of the same characteristics. They are extremely dry, extremely cold or extremely dead. Death Valley is one of his favorites. This i

英语听力：自然百科 圣河之旅 Yangtze 长江—17

-It's time we got out on the river. We're heading to a port. We're gonna get on a boat.As China's boom, so the newly affluent middle class have started taking holidays around the world. But of course, they're also exploring their vast country and ric

英语听力：自然百科 圣河之旅 Yangtze 长江—13

Consumerism is almost an ideology. I dont think it just necessarily here. Well, before, China used to be very poor and we didnt have enough food to eat, so you may imagine when people got rich. Of course, the first of the thing, people want to eat fo

英语听力：自然百科 圣河之旅 Yangtze 长江—14

Although China is an officially atheist country, survey suggests that up to 85 percent of people here believe in something, either spiritual or religious. -First, you're gonna light this candle. -Light a candle. -According to Buddhism, to light the c

英语听力：自然百科 圣河之旅 Yangtze 长江—15

When the aspects of daily life are clearly improved here, education, health care, economy, legal rights, but the environment has taken some new hammering. The small environmental group was started by You Jianfeng with 10,000 pounds of his own money.

英语听力：自然百科 圣河之旅 Yangtze 长江—16

Water and air pollution are major problems in China. Some resports suggest half of urban water supplies are unfit for washing. Let alone drink. It's a controversial subject for a new breed environmental activist.-Why do you do this? You must get a lo

英语听力：自然百科 圣河之旅 Yangtze 长江—18

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英语听力：自然百科 圣河之旅 Yangtze 长江—19

As night fell, Lily and I naturally felt obliged to get a taste of onboard entertainment.-We are here to celebrate China's ancient culture. I've given a happy slapper and a light s*. Some people think of China as unfriendly and a little duller, not a

英语听力：自然百科 圣河之旅 Yangtze 长江—20

It generates vast amounts of hydroelectricity, equivalent of more than half a dozen nuclear power stations. It's longer than 25 football pitches and higher than a 40-story building. Since the 1950s, the Chinese have built more than 22,000 large dams,

英语听力：自然百科 圣河之旅 Yangtze 长江—21

If Mao could build this giant edifice, he could prove that the communist party could conquer nature, and it was greater and more powerful than the ancient Gods. So we have been landing on the top of the dam. This is a sensitive strategic location bec

英语听力：自然百科 圣河之旅 Yangtze 长江—22

-Something like 10 percent of population of the planet live in the basin, the wide area around the Yangtze River. That is how important this water, this river, is. Just come over here, look what we as a species are capable of. This is, it's display h

英语听力：自然百科 圣河之旅 Yangtze 长江—23

-Now people are more and more aware of this issue, because in the past 20 years, Chinese people were really focusing on, you know, develop the economy and get rid of the poverty. And nowadays, lots of people start to really watch the long, long term