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  • Earth and Sky:Moon and Jupiter 月球和木星

    Moon and Jupiter 月球和木星 After traveling behind the sun for several months, the planet Jupiter is now visible again, just before sunup. Learn how to see Jupiter near the waning moon on Wednesday morning -- on today's Earth and Sky. JB: This is Ea...

  • Earth and Sky:Sunscreened Plants 遮光植物

    Sunscreened Plants 遮光植物 A NASA researcher is finding that alfalfa plants grow more poorly when exposed to UVB -- ultraviolet B radiation from the sun. Learn more about sunscreened plants -- today on Earth and Sky. JB: This is Earth and Sky. Eart...

  • Earth and Sky:Global Warming and Ozone 全球变暖和臭氧

    Global Warming and Ozone 全球变暖和臭氧 Could the coming century bring a new threat to the ozone layer? Discover one scientist's model of the effect of global warming and greenhouse gases on ozone -- on today's Earth and Sky. DB: This is Earth and S...

  • Earth and Sky:Fire Cycle 火灾规律

    Fire Cycle 火灾规律 The El Nino phenomenon of 1997-98 unleashed torrential rain in some parts of the world, while creating abnormally dry conditions in others. And it sparked record numbers of wildfires. Learn more about climate and wildfire -- toda...

  • Earth and Sky:Fire Regime 火

    Fire Regime 火 Fire was a creation of life -- born from oxygen and organic matter -- ignited by lightning. Thus fire has been a fundamental feature of the Earth for at least 400 million years. A scientist talks about fire -- today on Earth and Sky....

  • Earth and Sky:Sierra Treeline 山脊树林

    Sierra Treeline 山脊树林 Could global warming allow forests to expand into higher elevations than they have reached in more than a thousand years? Learn more about studying alpine treelines -- today on Earth and Sky. JB: This is Earth and Sky. The h...

  • Earth and Sky:Black and White 黑与白

    Black and White黑与白 Sometimes you hear it said that white is a combination of all the colors of the rainbow -- and that black is the absence of color. Find out more about whether black and white are colors -- today on Earth and Sky. JB: This is Ear...

  • 2007年VOA标准英语-Sydney Turns Off Lights for 'Earth Hour'

    By Phil Mercer Sydney 01 April 2007 Difference of switching many of the city's lights is shown in this combo taken one week apart in Sydney, on 24 Mar 2007, above, and 31 Mar 2007, below Parts of Australia's biggest city, Sydney, plunged into near da...

  • 2006年VOA标准英语-Melting of Earth’s Poles Confirmed

    By Paul Sisco Washington, D.C. 24 November 2006 watch Polar Melting report 2007 is International Polar Year. It's an international effort to spur scientific research at the most forbidding places on Earth, primarily because many in science consider...

  • 俚语口头禅:Down-to-earth[实事求是的]

    【句子对照】 Timothy is really down-to-earth; if you want some advice, you ought to talk to him. 蒂姆是个很讲求实际的人。如果你需要一些建议,应该和他谈谈。 【关键俚语】 Down-to-earth 英:Someone who is sensible and practical; a rational, level-heade...

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