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A good teacher, A good luck I have come to believe that a great teacher is a great 1) artist and that there are as few as there are any other great artists. It might even be the greatest of the arts s
疯狂英语2003年
[ti:UNIT 1 The Olympics Lesson 4 Good Luck to You] [0:00.369]UNIT 1 第一单元 [0:01.604]The Olympics 奥运会 [0:03.311]Lesson 4: 第四课： [0:04.778]Good Luck to You 祝你好运 [0:09.579]Do your best! 做到最好！ [0:11.553]Don't give up
河北教育初中英语（初中起点）九年级上
By Steve Schy Turin, Italy 11 February 2006 Team Canada may have had an extra bit of luck on their way to the men's ice hockey gold medal at the 2002 Olympics in Salt Lake City. A Canadian coin that b
2006年VOA标准英语（二月）
By David McAlary Washington 10 January 2006 Before you continue thinking about our Milky Way galaxy as a peaceful, spiral disk of stars slowly rotating through the heavens, consider this: It is hungri
2006年VOA标准英语（一月）
And every faint smudge of light you are looking at is a galaxy. For Richard Ellis, it's a galactic treasure trove. So much like an archaeologist/, we piece together history by digging into deeper and deeper layers. So a cosmologist like myself, uses
自然百科2011年
A new galaxy is formed where, instead of the discs that the original galaxies have, where all the stars are going around more or less on a plane. Instead the stars are going every which way just like the elliptical galaxies that we see. And so we are
自然百科2011年
Venus is closer to the Sun, Mars is farther from the Sun. And there is a zone in between, the blazing hot furnace Venus, the frigid Mars. That zone in between we call a habitable zone and the earth lies smack in that thing where water would be in liq
自然百科2011年
One type of giant planet orbits very close to its star, we call them hot Jupiters because these Jupiter-like planets are so close that they are blowtorched by the intense heat from the star. The other sort of planet we have found is also bizarre. Wev
自然百科2011年
The first stars in our Milky Way were fearsome high-octane stars, burning their hydrogen fuel at tremendous rates, rushing through their life cycle. They like the rockslides. They live fast and die young. They run out of their fuel very quickly and e
自然百科2011年
But our time traveling isnt yet over. There is still the question of how the first galaxies kindled the very first stars. We are on a journey visiting the Dark Ages, a time over 12.5 billion years ago. The sight is spectacular. The sky is ablaze with
自然百科2011年
What happens is that, first the dark matter forms the structure, the ordinary matter then follows the dark matter. The ordinary matter is hydrogen and helium at this stage. And the hydrogen and helium fall/ to the center of the dark matter halos that
自然百科2011年
Its extremely frustrating because this region, this time period holds within it, in some sense, the rose headstone of / galaxy formation. But there are clues as to what was happening inside those dense hydrogen clouds. Look back even further in time
自然百科2011年
But dark matter does more than simply holds galaxy like ours together. Astronomers think it binds the Milky Way into an extraordinary structure along with billions of other galaxies. To explore it, we'll take a journey to the very edge of the univers
自然百科2011年
Imagine the disc of our galaxy, if you just took a disc of stars and put it there, gravity would tend to make this disc collapse/ into itself and it would immediately just fall together. That is not what we see with the galaxy. Whats actually going o
自然百科2011年
All of the galaxies, all of the stars, and gas and dust and planets, and everything else that we can see with our greatest telescopes represent about half of one percent of whats actually/out there. The rest is invisible. It is mostly some mysterious
自然百科2011年
They were once thought to mark the outer limits, but today astronomers believe the Milky Way galaxy is much bigger than what we can see. To understand why, we will travel to the stars of the outer galactic disc. Far from our usual place in space, we
自然百科2011年
To understand how these calamities occur, astronomers need to catch a massive star in its death throes. Astronomers are like detectives. We have to figure out what's going on in the universe, sometimes based on a minimum number of clues. And in the c
自然百科2011年
Once theyve caught the light of a dying star with their state of our telescopes. The detective work can begin. We collect that light and we analyze it in great detail in order to determine whats going on, whats the chemical makeup of the star, whats
自然百科2011年
AMERICAN MOSAIC - Senior Citizens Sing for Health and Fifteen-Year-Old Kyla Ross Heads to the Olympics JUNE SIMMS: Welcome to AMERICAN MOSAIC in VOA Special English. (MUSIC) Im June Simms. This week, we play new music from singer John Mayer. We also
2012年VOA慢速英语(七)月
By Ron Corben Bangkok 02 May 2006 High global oil prices are taking their toll in Thailand, where the nation's fishing fleet - one of the largest in Southeast Asia - has been affected. Hundreds of ves
2006年VOA标准英语（五月）