Scientific American 60 Second Science听抄（有音频文件）

H-KevinUID: 2182070

June 27

Based on kelediguo

This week scientists from University of Utah announced that if the earth’s crust were not toasted warm, most of North American would be under sea. Most people think the mountain is made by moving tectonic plates, those massive slabs of land that drift across the earth’s surface. True tectonic forces do build mountains. But they do so in part by changing the temperature of the rocks they move. Hot rocks are less dense, and more buoyant. And the more buoyant you are, the higher you float. The Utah scientist use computer program to chill the North American crust about 750 Fahrenheit. That is the temperature of the coldest crystal rock of the continent that covers half of Canada. Without the heat, North America sank. New York City, drop a quarter of miles beneath the Atlantic. Dallas, Chicago, Las Vegas, all blub blub blub. Interestingly the adjustment causes Seattle to soar to an elevation nearly 6000 feet. That is because the Emerald city happen to be set on a crust colder than average. So twist the temperature make that place warmer and higher. Just something to keep you in mind, if you are looking to see high ground.

H-KevinUID: 2182070

June 28

Based on haieryu

It is a mystery that has vexed astronomers for possibly 1,500 years: odd optical flashes that occasionally appear on the surface of the moon. The flashes were dubbed Transient Lunar Phenomena or TLPs. The lunar surface seems to change in brightness, bleariness of color; TLPs can last for a few minutes and cover a few kilometers. Now an astronomer of Columbia University thinks he knows what's causing the strange optical affects. Other researchers have conjectured that the release of gas from under the surface might be involved. And Columbia's Oreland Carts has uncovered strong statistical relationship between recorded accounts of TLPs and outguessing events that were documented by spacecraft. The 1971 Apollo 15 flight and 1996 lunar prospect robotic mission provided key data. The research could lead to a more comprehensive understanding of the conditions under which gases escapes from the moon's interior. It looks like a lot of that gas could be Radon, so any moon bases could have the same problem many homeowners do on the earth-Radon basement.

f_dingUID: 2283047

强啊，
很多细节我怎么听不出来？你听了几遍？

forerunnerUID: 2234967

Radon is a significant contaminant that affects indoor air qualityworldwide. Radon gas from natural sources can accumulate in buildingsand reportedly causes 21,000 lung cancer deaths :eek::eek:per year in the United States alone

calf1008UID: 2342418

+U

forerunnerUID: 2234967

It is a mystery that has vexed astronomers for possibly 1,500 years: odd optical flashes that occasionally appear on the surface of the moon. The flashes were dubbed Transient Lunar Phenomena or TLPs. The lunar surface seems to change in brightness, blurriness of color， TLPs can last for a few minutes and cover a few kilometers. Now an astronomer of Columbia University thinks he knows what's causing the strange optical affects. Other researchers have conjectured that the release of gas from under the surface might be involved. And Columbia's Oreland Carts:confused: has uncovered strong statistical relationship between recorded accounts of TLPs and outguessing events that were documented by spacecraft. The 1971 Apollo 15 flight and 1996 lunar prospect robotic mission provided key data. The research could lead to a more comprehensive understanding of the conditions under which gases escapes from the moon's interior. It looks like a lot of that gas could be Radon, so any moon bases could have the same problem many homeowners do on the earth-Radon basement.


[ 本帖最后由 forerunner 于 2007-6-28 21:47 编辑 ]

f_dingUID: 2283047

今天第一次听，厚着脸皮发上来了，大家别见笑。
发现很多问题，打算好好的总结一下，希望能和大家共同进步！
自己的听力还有很长的路要走，时间紧，任务重！
大家加油！

It's a mystery that (has vexed) astronomers for possibly fifteen hundred years. (Odd) optical flashes that occasionally appear on the surface of the moon, the flashes were dubbed Transient Lunar Phenomena or TLPs. The lunar surface seems to change brightness, ( ) or color. TLPs can last (for) a few minutes and cover a few kilometers. Now an astronomer of Columbia University thinks he knows what's causing the strange optical effects. Other researchers conjecture that the release of gas from (under)the lunar surface might be involved and Columbia's () says(has) uncovered strong statistical relationship between recorded accounts of TOPs and out gas events that would (were documented)document by spacecraft, the 1971 Apollo15 flight and 1998 lunar prospect robotic mission provided key data. The research could lead to more comprehensive understanding of the conditions under which gas escapes from moon's (interior). It looks like a lot (of that) the gas could be ( ) so that any moon base could (have) the same problem many homers (homeowners) do on the earth-.

kelediguoUID: 149939

原帖由 zhenzhen_163 于 2007-6-28 16:24 发表


冒犯了,Kevin,I beg to differ.

“You should have just something to keep in mind”不是地道英语（idiomatic English），不信可以去google一下。不能这么解释。

“Just something to keep in min ...

“Just something to keep in mind.” 或“It’s just something to keep in mind.”都是固定字串，多个字，少个字都不成。美国人常用，没得说，只能乖乖的背起来。前者Google里有小5万个citations，后者有小3万个!

同志们，多做阅读啊。


I totally agree.

其实有好多句子听写的时候一带就过去了，倒是没有想它是怎么来的。

kelediguoUID: 149939

2007-06-28

It’s a mystery that has vexed astronomers for possibly 1500 years: odd optical flashes that occasionally appear on the surface of the moon. The flashes were dubbed transient lunar phenomena or TLPs. The lunar surface seems to change in brightness, blurriness or color. TLPs can last for a few minutes and cover a few kilometers. Now an astronomer in Columbia University thinks he knows what’s causing the strange optical effects. Other researchers have conjectured that the release of gas from under the surface might be involved. And Columbia’s Arlin Crotts has uncovered strong statistical relationship between recorded accounts of TLPs and outgassing events that were documented by spacecraft. The 1971 Apollo 15 Flight and 1998 Lunar Prospector Robotic Mission provided key data. The research could lead to a more comprehensive understanding of the conditions under which gas escapes from the moon’s interior. It looks like a lot of that gas could be radon, so any moon bases could have the same problem any homeowners do on earth--radon in the basement.

[ 本帖最后由 kelediguo 于 2007-6-28 23:03 编辑 ]

kevinliu6883UID: 2338522

It is a mystery that has vexed astronomers for possibly 1500 years. Odd optical flashes that occasionally appear on the surface of the moon. The flashes were dubbed transient lunar phenomena or TLPs. The lunar surface seems to change brightness, blurriness or color.  TLP can last for a few minutes and cover a few of kilometers. Now an astronomer at Columbia University thinks he knows what’s causing the strange optical effects. Other researchers have conjectured that the release of gas from under the surface may be involved. And Columbia’s Allen Carts has uncovered strong statistical relationship between recorded accounts of TLPs and out gassing events that would be documented by spacecraft.  In 1971 Apollo 15 flight and 1996 lunar prospect robotic mission provided key data. The research could lead to a more comprehending understanding of the conditions under which gas escapes from the moon’s interior. It looks a lot of that gas could be Radon, so any moon base could have the same problem many homeowners do on the earth, Radon on a basement.

kevinliu6883UID: 2338522

Thank you for correcting my wrong explanation.
This really helped me.

[ 本帖最后由 kevinliu6883 于 2007-6-28 23:55 编辑 ]

drowningbabyUID: 2351751

6月28号的好多单词不认识啊:(
背单词啊~~~~~~~~~

drowningbabyUID: 2351751

June 27
Based on 786楼 kelediguo

This week scientists from the University of Utah announced that if the Earth’s crust weren’t so toasty warm, most of North America would be under sea. Most people think that mountains are made by the movement of tectonic plates, those massive slabs of land that drifted across the Earth’s surface. True tectonic forces do build mountains, but they do so in part by changing the temperature of the rocks they move. Hot rocks are less dense and more buoyant. And the more buoyant you are, the higher you float. The Utah scientists use computer program to chill the North American curst to about 750 degrees Fahrenheit, that's the temperature of the coldest crustal rock in the continent which covers half of Canada. Without the heat, North America sank. New York City dropped a quarter mile into the Atlantic, Dallas, Chicago, Las Vegas ... all blub blub blub. Interestingly, the adjustment causes Seattle to soar to an elevation of nearly 6000 feet. That's because the Emerald City happens to be sitting on a crust that’s colder than average. So tweaking the temperatures makes that area warmer and higher. Just something to keep in mind if you are looking to seek the high ground.

H-KevinUID: 2182070

听了很多很多遍，估计十几遍还是有的

finalmanUID: 2275821

6/28参考资料



Columbia astronomy professor Arlin Crotts thinks he has solved a 400-year-old mystery: the origin of strange optical flashes often reported as appearing on the moon’s surface.
Transient Lunar Phenomena (TLPs), in which the lunar surface reportedly changes in brightness, blurriness or color, have been photographed and observed by thousands of astronomers over the centuries. Yet explanations of why they occur and even their reality as true lunar phenomena have been hotly debated. The TLPs typically cover a space of a few kilometers and last for several minutes.

Crotts has uncovered a strong statistical relationship between TLPs and so-called outgassing events on the lunar surface. Outgassing occurs when gases trapped beneath a moon or planet are released and, if only briefly, become part of the object’s atmosphere. A key component of this gas is radon.

“People over the years have attributed TLPs to all sorts of effects: turbulence in Earth's atmosphere, visual physiological effects, atmospheric smearing of light like a prism, and even psychological effects like hysteria or planted suggestion” says Crotts, “but TLPs correlate strongly with radon gas leaking from the moon. No earth-bound effect can fake that.”

To arrive at his theory, Crotts correlated TLPs with known gas outbursts from the lunar surface as seen by several spacecraft, particularly NASA’s Apollo 15 mission in 1971 and the robotic Lunar Prospector in 1998. What he discovered was a remarkable similarity in the pattern of outgassing event locations recorded by spacecraft across the face of the moon and reported TLP sites.

The pattern was further strengthened after Crotts performed a statistical test to rid the sample list of false reports and one time events that might not represent true outgassing sources. “The result,” says Crotts “shows that some lunar event sites that were the focus of great observer excitement over recent decades disappeared from the more highly refined list of TLP sites.” Crotts used two catalogs of such sightings amassed and edited three decades ago by now retired astronomers Barbara Middlehurst and Winifred Cameron.

Crotts says this research might lead to optical imaging of the lunar surface that could monitor how, when and where gas escapes from the moon. While the exact composition of this gas is largely unknown, he explains, hints from previous measurements indicate that it might contain substances beneficial for future moon explorations, especially water.

Until now, Crotts says two factors have worked against researchers solving the mystery of TLPs. Historically, outgassing has often been discussed by scientists, but many have considered the moon volcanically dead despite moonquakes and episodes of gas, such as argon, observed coming from the lunar surface. Another deterrent to researchers is the daunting volume of visual data associated with TLPs – a fact that plays to Crotts’ particular research interest and skills.

Along with collaborators Professors Paul Hickson from the University of British Columbia, and Thomas Pfrommer and Cameron Hummels of Columbia, Crotts recently built the robotic camera at Cerro Tololo Inter-American Observatory in northern Chile. It will automatically scan the moon for TLPs every few seconds and produce an unbiased map of the distribution, free of potentially flawed sightings due to human error, poor equipment, or improperly recorded observations that have dominated TLP studies until now. The scientists are planning even more monitors and hope they will establish with much greater accuracy the exact locations of gas leaks on the moon.

Crotts says improved TLP maps are already pointing to intriguing features on the lunar surface, and he is currently preparing a separate article on that subject.

Source: by David Poratta, Columbia University