Transcript for Reference Only --chunshan The infrared astronomical satellite, now celebrating its 25th anniversary, gave us the first all sky view of our dusty infrared universe. Floating above the galactic center is the Rho Ophiuchi Cloud, about 400

发表于:2019-02-26 / 阅读(265) / 评论(0)

自然百科2008年

英语听力：自然百科意大利风情:The Art of the Feast—17

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发表于:2019-02-26 / 阅读(180) / 评论(0)

自然百科2015年

英语听力：自然百科意大利风情:The Art of the Feast—20

发表于:2019-02-26 / 阅读(264) / 评论(0)

自然百科2015年

英语听力：自然百科意大利风情:The Art of the Feast—23

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自然百科2015年

英语听力：自然百科金星和水星旅行指南 Venus and Mercury-7

Like Mercury, the earth takes a beating from the sun's violent temper. Flares, sun storms and other solar hissy fits can cause electronic mayhem for the satellites that roam above our heads. Fortunately, the earth is protected from this radiation by

发表于:2019-02-15 / 阅读(283) / 评论(0)

自然百科2012年

英语听力：自然百科冰冻星球前往地球尽头—24

End of the run. No! Ive got him coming out, I just didnt get him going back in. All right! Below the sea ice, the dive team is setting up an underwater studio. Using a rang of waterproof lights and time-lapse cameras, they hope to capture the growth

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自然百科2012年

英语听力：自然百科冰冻星球前往地球尽头—23

Youve got these beautiful clear glass-like pillars and right next to it, its really delicate. Look at in them, filament is there. As the cave team explore deeper, each chamber reveals ice crystals more strange and spectacular than the last. No one on

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自然百科2012年

英语听力：自然百科冰冻星球前往地球尽头—22

Serious produce server Neser Balwich directs from the front seat while aerial cameraman Mike Calen controls the camera attached to the lows. Above 10,000 feet, the pilot must breathe oxygen through a passed tool beneath the nostrils. Approaching the

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自然百科2012年

英语听力：自然百科冰冻星球前往地球尽头—21

The greatest challenge for the team-making frozen planet was the extremely remote of their locations. Many of the shoots lasted almost the time and needed a number of clues to join forces. One location that world classic of see the Antarctic was Moun

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自然百科2012年

英语听力：自然百科冰冻星球前往地球尽头—19

They were travelling on foot and their first sight of this mountains must have been daunting indeed. In front of them stretched one of the world's longest ranges, spanning two thousand miles from one side of the continent to the other. The winds uphi

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自然百科2012年

英语听力：自然百科冰冻星球前往地球尽头—20

These ice blocks are the size of sky creepers, and this is the bill of more glance with scoten seize man somehow travel on foot. It is one hundred miles long and one of the largest species on earth. Not nothing could prepare those early ex-dollars fo

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自然百科2012年

英语听力：自然百科金星和水星旅行指南 Venus and Mercury-17

You never guess the dangers on the ground from orbit, except maybe for this, massive, double-barreled storms hovering above the poles. Of this, what we called dipole features trailing around, we don't know what, really what they are, but the whole fe

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自然百科2012年

英语听力：自然百科金星和水星旅行指南 Venus and Mercury-19

Valor will be tackling the acid clouds of Venus with little help from flying pan technology. This being two weather balloons are we watched Venus in the mid-1980s. This with wagon machines there were two sep balloons that the Russians put them in the

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自然百科2012年

英语听力：自然百科金星和水星旅行指南 Venus and Mercury-18

Despite all this scientific effort, we still don't know what triggered Venus' diabolical transformation. People debated over whether Venus ever had a moon. If Venus had a satellite at one point, could that satellite eventually impacted onto the surfa

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自然百科2012年

英语听力：自然百科金星和水星旅行指南 Venus and Mercury-16

Congratulations, you've arrived on the hottest surface in the solar system. Here, the official temperature is eight hundred seventy degrees Fahrenheit. Day or night, equator or pole, the searing heat never varies more than a few degrees, and thats wh

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自然百科2012年

英语听力：自然百科金星和水星旅行指南 Venus and Mercury-15

One of the really exciting and high-level scientific interests is whether Venus is geological active today, because there are reasons to think of the clouds on Venus only exist, because there is ongoing geological activity, so this is one of the bigg

发表于:2019-02-15 / 阅读(183) / 评论(0)

自然百科2012年

英语听力：自然百科金星和水星旅行指南 Venus and Mercury-14

On earth, Hawaii has some of the most spectacular shield volcanoes that are very similar with the volcanoes we see on Venus. The huge gently sloped volcanoes of Hawaii may be impressive. On Venus there are at least 150 ranging from this size to ten t

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自然百科2012年

英语听力：自然百科金星和水星旅行指南 Venus and Mercury-1

Everyone likes a vacation in a warm climate, but how about a trip to two planets that are as hot as hell? If you are walking on the surface of Mercury, you need one heck of a spacesuit. Mysterious Mercury appears lifeless and desolate, but hidden dee

发表于:2019-02-05 / 阅读(205) / 评论(0)

自然百科2012年

英语听力：自然百科金星和水星旅行指南 Venus and Mercury-2

Ever wanted to be an astronaut? Imagine it was you, who was heading to the hot zone of the two inner planets, where would you go? What would you see? And how would you survive? The latest robotic machines have revealed more about these worlds than ev

发表于:2019-02-05 / 阅读(198) / 评论(0)

自然百科2012年

英语听力：自然百科金星和水星旅行指南 Venus and Mercury-9

And its here in a freezer that Messenger will encounter another puzzle: can ice exist on a planet so close to the sun? It's only when the first radar observations to the surface of Mercury were obtained back in the 90s that it was discovered that Mer

发表于:2019-02-05 / 阅读(204) / 评论(0)

自然百科2012年

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