单词：hepatolithiases
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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
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
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
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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 Mike O'Sullivan Los Angeles 14 February 2006 Hollywood's motion picture academy honored nominees for the Oscars Monday, as the countdown gets under way for the annual film awards. A luncheon gave n
2006年VOA标准英语（二月）