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

jiangshuUID: 2333888

:confused:

bolai808UID: 2206779

点击预览帖子按钮，若是字体不合适，就进行调整

liucirongUID: 2215759

August 09, 2007: 60-Second Science Athletes Should Just Chill

Putting athletes into a cooling chamber for a brief period prior to a training session seems to improve performance. Steve Mirsky reports.

Some studies have hinted that athletes might be better off if they can better dump off some of the heat their muscles’ generate. Now comes new research that adds credence to the idea that athletes indeed should just chill. Other studies of testing(have tested) the idea of cooling down athletes after they workouts to improve recovery but this study look at the effect of chilling them before their workouts to improve performance. Scientists from a couple of GermanUniversity put more than 50 athletes into a cooling chamber where the temperature was a frosty -120oC. The athletes stayed at deep freeze for two and a half minutes. They then did an enduring run at 90% of their maximum capacity. After 6 months, they cooled athletes showed much better results and an increased oxygen-carrying capacity. The scientist think that chilling slow the inevitable rising body temperature that impedes performance, chilling also concerns(conserves) body fluoids(fluids) because the competitor doesn’t have to sweat much to cool down. Look for icy athletes at the Summer Olympics next year in Beijing.

New words:

credence

  n.信任

frosty

adj. 结霜的, 严寒的, 霜状的, 冷淡的, (头发)灰白的, 多霜

inevitable

  adj.不可避免的, 必然的

workout

  n.测验

Impede

  阻止

听不出or辨音:
workouts to improve recovery
oxygen-carrying
inevitable rising
conserves
competitor
sweat

拼写:
fluoids(fluids)
Olympics

语法+辨音:
of testing(have tested)

dcbUID: 2232749

Aug 10

You can lie down on the job and still do some science very early Monday morning. Because the first few hours of August 13th are the best time to view the annual Perseid Meteor Shower. And a concurred new moon means that condition should be very good to see a lot of shooting stars. The following few days should provide good viewing, too. The bright stricks of light you'll see in the sky are particles of dust ejected by the comet Swift-Tuttle burning up about 80 miles overhead. We pass through this cosmic rubble at the same time each year. The particles hit the atmosphere at about 37 miles per second, which creates a white hot streak of super heat at there. The shooting stars seem to be coming out of the constellation Perseus, near Cassiopeia, hence the name Perseids. The dust molds(not sure) are mighty small, ranging from the size of a grain of sand to perhaps a pea. In fact, to get the ideas--the estimated size, color and texture of the particles, just open a box of great nuts which you can then have a breakfast. So find some open sky, lie down and enjoy.


[ 本帖最后由 dcb 于 2007-8-10 13:50 编辑 ]

tongwawawUID: 2176887

Aug 10

You can lie down on a job and still lose a science very early Monday morning because the first few hours of Aug 13 saw the best time to view the annual perse meteor shower and concurrent new moon means the condition be very good to see a lot of shooting stars. The following few days should provide good views too. The bright streak of bright you will see in the sky are particles o dust dejected by the comic swift tutle, burning up about 100 mile over head. We passed through this cosmic rubble at the same time each year. The particles sat at the atmosphere about 37 mile/sec which create a white hot streak of super heat there. The shooting star seems to become out of constitution persa near the casi appear ends the name persais. The dusts most are mighty small, ranging from the size of green of sand to perhaps a pea. In fact , to get an idea to estimate size, color, and texture of the particles, just open a box of great nuts. Would you get a minute for breakfast. So find some open sky, lie down, and enjoy.

头一次来凑热闹.....有些地方听得很不好

LS好强，貌似标准答案^^

[ 本帖最后由 tongwawaw 于 2007-8-10 13:40 编辑 ]

xbx_leeUID: 129512

到右下角回复主题里去回复。不要用快速回复（当然直接写html的当我没说）。

xbx_leeUID: 129512

You can lie down on the job and still(?)some science very early Monday morning. Because the first few hours of Aug. 13th thought the best time to view the annual Perseid Meteor Shower. And a concurrent new moon means that condition should be good to see a lot of shooting stars. The following few days should provide good viewing, too. The bright streaks of light you'll see in the sky are particles of dust ejected by the Comet Swift-Tuttle, burning out about 80 miles over head. We pass through this cosmic rubble at the same time each year. The particles hit the atmosphere at about 37 miles per second, which creates a white hot streak of super heat there. The shooting stars seem to be coming out of the constellation Perseus near Cassiopeia, hence the name Perseids. The dust modes are mighty small ranging from the size of a grand of sand to perhaps a pea. In fact, to get a idea of estimated size, color and texture of the particles, just open a box of great nuts, which you can then have a breakfast. So find some open sky, lie down and enjoy.

[ 本帖最后由 xbx_lee 于 2007-8-10 15:45 编辑 ]

kevinliu6883UID: 2338522

You can lie down on a job and still do some science very early Monday morning, because the first few hours of August 13th is the best time to view annual Perseid meteor shower. And a concurrent new moon means that the condition should be very good to see a lot of shooting stars. The following few days should provide good view too. The bright streaks pf light you’ll see in the sky are particles of dust ejected by the comic Swift-Tuttle, burning out about 80 miles over head. We pass through this cosmic rubble at the same time each year. The particles hit atmosphere at about 37 miles per second, which create a white hot streak of super heat there. The shooting stars seem to be coming from constellation Perseid near Cassiopeia, hence the name Preseid. The dust motes might be small range from size of a grain of sand to perhaps a pea. In fact, to get an idea of the estimated size, color and texture of the particles, just open a box of great nuts, which you can have a breakfast. So find more in open sky, lie down and enjoy.

kevinliu6883UID: 2338522

Every August, just when many people go vacationing in the country where skies are dark, the best-known meteor shower makes its appearance.

The annual Perseid meteor shower is expected to be at its best this year, producing one or two meteors per minute during peak hours.

"It's going to be a great show," said Bill Cooke of NASA's Meteoroid Environment Office at the Marshall Space Flight Center in Alabama.

August is also known as the month of "The Tears of St. Lawrence." Laurentius, a Christian deacon, is said to have been martyred by the Romans in 258 AD on an iron outdoor stove. It was in the midst of this torture that Laurentius cried out: "I am already roasted on one side and, if thou wouldst have me well cooked, it is time to turn me on the other."

The saint's death was commemorated on his feast day, Aug. 10. King Phillip II of Spain built his monastery place, the "Escorial," on the plan of the holy gridiron. And the abundant shooting stars seen annually between approximately Aug. 8 and 14 have come to be known as St. Lawrence's "fiery tears."

The reality
We know today that these meteors are actually the dusty remains left behind by Comet Swift-Tuttle.

Discovered back in 1862, and most recently observed in 1992, this comet takes approximately 130 years to circle the sun. And in much the same way that Comet Tempel-Tuttle leaves a trail of debris along its orbit to produce the Leonid meteors of November, Comet Swift-Tuttle produces a similar debris trail along its orbit to cause the Perseids.

Indeed, every year during mid-August, when Earth passes close to the orbit of Swift-Tuttle, the material left behind by the comet from its previous visits rams into our atmosphere at approximately 37 miles per second (60 kilometers per second) and creates bright streaks of light in our midsummer night skies.

Perfect prospects
According to the best estimates, this year Earth is predicted to cut through the densest part of the Perseid stream sometime around 2 a.m. ET on Monday. That corresponds to 11 p.m. PT Sunday for those living in the western United States or Canada.

The interval when the meteors will be falling at their highest rates will likely last several hours or more on either side of these times.

As a result, it is the late-night hours Sunday, on through the first light of dawn Monday, that holds the greatest promise of seeing a very fine Perseid display.

The moon, whose bright light almost totally wrecked last year's shower, will have zero impact this year. The moon will be new on Sunday, meaning that there will be no interference from it at all.

Perfect!

What to expect
A very good shower will produce about one meteor per minute for a given observer under a dark country sky. Any light pollution or moonlight considerably reduces the count.

The August Perseids are among the strongest of the readily observed annual meteor showers, and at maximum activity the display nominally yields 90 or 100 meteors per hour. Observers with exceptional skies often record even larger numbers. Typically during an overnight watch, the Perseids are capable of producing a number of bright, flaring and fragmenting meteors, which leave fine trains in their wake.

On the night of shower maximum, the Perseid radiant is not far from the famous "Double Star Cluster" of Perseus (hence the name, "Perseid"). Low in the northeast during the early evening, it rises higher in the sky until morning twilight ends observing. Shower members appearing close to the radiant have foreshortened tracks; those appearing farther away are often brighter, have longer tracks, and move faster across the sky.

About five to 10 of the meteors seen in any given hour will not fit this geometric pattern, and may be classified as sporadic or as members of some other (minor) shower.

Plan your time
Perseid activity increases sharply in the hours after midnight, so plan your observing times accordingly. We are then looking more nearly face-on into the direction of the Earth's motion as it orbits the sun, and the radiant is also higher up.

Making a meteor count is as simple as lying in a lawn chair or on the ground and marking on a clipboard whenever a shooting star is seen. Watching for the Perseids consists of lying back, gazing up into the stars, and waiting. It is customary to watch the point halfway between the radiant (which will be rising in the northeast sky) and the zenith, though it's perfectly all right for your gaze to wander.
Counts should be made on several nights before and after the predicted maximum, so the behavior of the shower away from its peak can be determined.
Usually, good numbers of meteors should be seen on the preceding and following nights as well. The shower is generally at one-quarter strength one or two nights before and after maximum. A few Perseids can be seen as much as two weeks before and a week after the peak. The extreme limits, in fact, are said to extend from July 17 to Aug. 24, though an occasional Perseid meteor may be seen almost anytime during the month of August.
In addition to the Perseids, some skywatchers will have an opportunity to view another potentially strong meteor display at the beginning of September: the Aurigid meteors. We'll have more details on this in next week's Night Sky, so stay tuned!

2007 Space.com

[ 本帖最后由 kevinliu6883 于 2007-8-11 01:43 编辑 ]

kelediguoUID: 149939

2007-8-10

You can lie down on the job and still do some science very early Monday morning, because the first few hours of August 13th are the best time to view the annual Perseid meteor shower. And a concurrent new moon means that condition should be very good to see a lot of shooting stars. The following few days should provide good viewing, too. The bright streaks of light you’ll see in the sky are particles of dust ejected by the comet Swift-Tuttle, burning up about 80 miles overhead. We pass through this cosmic rubble at the same time each year. The particles hit the atmosphere at about 37 miles per second, which creates a white hot streak of super heated air. The shooting stars seem to be coming out of the constellation Perseus near Cassiopeia, hence the name Perseids. The dust modes are mighty small, ranging from the size of a grain of sand to perhaps a pea. In fact, to get an idea of the estimated size, color and texture of the particles, just open a box of great nuts, which you can then have a breakfast. So find some open sky, lie down and enjoy.

zhzhyhitUID: 2249292

xiexie a

wcr27UID: 174576

有些疑问 望解答 on the job adv. 工作着,留心着；警惕着的意思 在这里是否是留心着的意思??
另外 do some science 是否是 后面所指的  view the annual Perseid meteor shower ??
最后的 great nuts 是个什么食物啊?

rebeccaddUID: 2262026

加油哈！

wlxzmUID: 2292462

You can lie down on the job and still ..science very early Monday morning, because the first     few hours of August 13--the best time to view the annual Perseid meteor shower, and concurrent new moon means that condition should be very good to see a lot shooting stars. The         following few days should provide good view too. The bright steaks of light you'll see in the    sky of particles of dust ejected by the Comet Swif Turtle burning up about 80 miles over head. We past this cosmic rubble at the same time each year. The particle...the armosphere about     thirty-seven miles per second which creates white hot streak of super heated there. The          shooting star seem to becoming out of the constellation,...appear..hence the name..The dust  motes are might be  small, ranging from the size of the grain of sand to perhaps a pea. In fact, get an idea the estimated size coloring texture of the particles just open a box of great nuts,  which you can then    have a breakfast, so find some open sky, lie down and enjoy.

perseid 八月流星  meteor shower 流星雨 shooting star 流星雨 particle 微粒 rubble 碎石
constellation 星座

还是很吃力啊:funk: 不知道大家感觉怎么样?

wx_chineseUID: 2210860

You can lie down on a job and still do some science very early Monday morning. Because the first few hours of August thirteenth is thought to be the best time to view the annual Perseid Meteor Shower. And a concurrent new moon means that condition should be very good to see a lot of shooting stars. The following few days should provide good viewing, too. The bright streaks of light you'll see in the sky are particles of dust ejected by the comet Swift-Tuttle, burning up at about 80 miles over head. We pastered these(pass through this) cosmic rubbles at the same time each year. The particles hit the atomphere at about 37 miles per second, which creates a white hot streak of superheated air. The shooting stars seem to be coming out of the constellation-Perseus, near Cassiopeia, hence the name "Perseids". The dust molds are mighty small, ranging from the size of a grain of sand to perhaps a pea. In fact, to get an idea of the estimated size, color and texture of the particles. Just open a box of great nuts which you can then have a breakfast.  So find some open skys, lie down and enjoy.
第一次发帖，倒数第二句看前面的都不太一样～～～～