单词：nephrolithiases
(nephrolithiasis 的复数)
单词：nephrolithiases 相关文章
Four times a year, Ghez focuses the telescope on the stars of the very heart of our Milky Way. She is looking for the telltale high speeds that reveal the presence of a black hole. The center of the M
超大质量黑洞
In every galaxy scientists looked at, they found evidence for a supermassive black hole. NGC 3115 NGC 3377 NGC 3379 In M31 and M32 In total there is probably 20-30 or so black holes that have been fou
超大质量黑洞
In March 2000, two astronomers made an extraordinary discovery, one that is set to overturn our understanding of how the universe formed. We're never going to see a time like this in astronomy again.
超大质量黑洞
But we are just one in 125 billion galaxies of different shapes and sizes spinning through space. Yet scientists haven't been able to explain how a single one of these galaxies was created. Galaxy for
超大质量黑洞
This ferocious heart of brilliant hot gas is called a quasar. Scientists thought this whirling mass might be caused by a giant black hole sucking up gas and stars, literally feeding on the center of a
超大质量黑洞
By measuring how fast these stars were moving, he could prove if there really was a black hole at the center of an active galaxy. I picked a galaxy nearby which is called NGC 1068, an active galaxy, w
超大质量黑洞
When it's feeding, a giant black hole creates a bright burning gas disk around it and then for some reason, it stops feeding, leaving a dark, deadly core lurking menacingly in the center of the galaxy
超大质量黑洞
Obama, Romney Differ on Energy Policy President Obama has been a champion of expanding renewable energy sources, such as wind and solar power, which he says hold great promise. Mitt Romney is a proponent of raising production levels of America's own
VOA标准英语2012年(十月)
Tim called Howard. Tim needed help. He needed help with his golf swing. He had a bad golf swing. He was a bad golfer. Howard had a good golf swing. He was a good golfer. Will you help me improve my golf swing? Tim asked. Yes, Ill help you improve you
简单慢速英语阅读
This correlation is the most important thing we've learned about supermassive black hole so far. Astronomers are always looking for correlations. Whenever you find one that's really tight like this on
超大质量黑洞
Most U.S. companies act swiftly and forcefully to root out discrimination based on race, sex, age, or appearance when they discover it. And there are good reasons to do so: intolerance on the job hurts morale and productivity. It's illegal under civ
VOA标准英语2008年（七月）
By Lisa McAdams Moscow 10 April 2007 Ukraine's political crisis enters its second week, with no signs of a breakthrough. Pro-reform President Viktor Yushchenko and Prime Minister Viktor Yanukovych, a supporter of closer ties with Moscow, have held mo
2007年VOA标准英语（四月）
By George Dwyer Washington, D.C. 03 May 2006 watch report on Bolivia The Bolivian Army is now guarding all petroleum facilities European and other South American nations have expressed concern over th
2006年VOA标准英语（五月）
By Sonja Pace London 28 March 2007 Britain has announced it is freezing all bilateral business with Iran, except efforts to gain the release of 15 British naval personnel seized by Iranian forces last Friday. As VOA's Sonja Pace reports from London,
2007年VOA标准英语（三月）
Ukraine and Russia are expressing concern about their image as reliable gas suppliers amid growing gas shortages in Europe, for which Moscow and Kyiv are blaming each other. European officials warn of a crisis across region as a dispute between Russ
VOA标准英语2009年(一月)
BBC Learning English Weekender Poles in the media Callum:Hello, I'm Callum Robertson and this is Weekender. One of the largest groups of new migrants to Britain are Poles. In 2004 Poland entered the European Union which gave Polish people much great
Weekender
By Gini Sikes New York 02 February 2006 New York City school children are celebrating Black History Month with an exhibit of portraits of Nelson Mandela at the landmark Rockefeller Center. The show's
2006年VOA标准英语（二月）
By Mike Cooper Atlanta 04 February 2006 Coretta Scott King during The Martin Luther King, Jr. Annual Commemorative Service in the Ebenezer Baptist Church, Heritage Sanctuary, in Atlanta (File photo -
2006年VOA标准英语（二月）
By Jessica Berman Washington 01 March 2006 About one-third of U.S. military personnel returning from the war in Iraq use mental health services after their return home, according to a study published
2006年VOA标准英语（三月）
By Patricia Nunan Kathmandu 08 February 2006 Polls have closed in Nepal's controversial municipal elections, which King Gyanendra said would be the first step toward restoring democratic freedoms acro
2006年VOA标准英语（二月）