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济南雅思培训学校:雅思听力背景材料2

2012-06-28 16:42 来源: 网络部 作者:网络 浏览
核心提示: 关于雅思听力, 济南雅思 专家发现:能听懂材料内容,做不对题的考生大有人在。针对这一问题, 济南雅思 专家分析:平时多阅读了解一些雅思听力的背景文章对听力考试有很大帮助,同时,对其他部分的能力提高也有所帮助。 对于上节中的背景材料,相信大家一定
关于雅思听力,济南雅思专家发现:能听懂材料内容,做不对题的考生大有人在。针对这一问题,济南雅思专家分析:平时多阅读了解一些雅思听力的背景文章对听力考试有很大帮助,同时,对其他部分的能力提高也有所帮助。

    对于上节中的背景材料,相信大家一定觉得还不够吧,下面济南雅思培训学校专家继续为考生们准备的雅思听力背景文章,希望对考生们有所帮助。

"This is opening the door to study of the interesting types of chemical reactions taking place inside planets and brown dwarfs," Jeanloz said. "Now that technology is able to reproduce the high pressures and temperatures found there, we are getting much better quality information on the chemical reactions taking place under these conditions."
 
"It is not amazing that chemistry like this happens inside planets, it's just that most people haven't dealt with the chemical reactions that can occur," Benedetti said. "The interior of these planets may be much more complicated that our current picture."
A simple calculation, for example, shows that the energy released by diamonds settling to the planet's core could account for the excess heat radiated by Neptune, that is, the heat given off by Neptune in excess of what it receives from the sun.
"What's exciting to us is the application of this high-pressure chemistry to understanding the outer planets," Jeanloz said.
"As more planets are found in unexpected orbits around other stars, the effects of internal chemical processes will need to be further clarified in order to obtain a general understanding of planet formation and evolution," the authors concluded in the Science paper.
Our solar system's other gas giant planets -- Jupiter and Saturn -- may also contain diamonds produced under such conditions, though they contain proportionately less methane than Neptune and Uranus. Based on theoretical calculations, Neptune and Uranus are estimated to contain about 10 to 15 percent methane under an outer atmosphere of hydrogen and helium. (See graphic for presumed internal structure of Neptune,
Several groups of researchers have suggested that the methane in these planets could conceivably turn into diamond at fairly shallow depths, about one tenth of the way to the center. Nearly two decades ago, a group at Lawrence Livermore National laboratory shocked some methane and reported the formation of diamond before the stuff evaporated. That group was led by retired scientist Marvin Ross and researchers William Nellis and Francis Ree.

    以上是济南雅思培训学校的专家为大家准备的雅思听力背景材料,希望考生们用心体会。如果你想快速提高雅思成绩请登录济南环球雅思官方网站或拨打0531-86927699进行咨询。

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