单词：fluorescences
[化] 荧光
n. light emitted during absorption of radiation of some other (invisible) wavelength
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By Jessica Berman Washington 31 May 2007 Scientists say early human ancestors may have begun walking on two legs on tree branches, not on the ground as commonly believed. The evidence contradicts the long-held belief that early humans first began wal
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by Jason Marshall In the last few articles, weve talked about fractions and percentages, and soon enough well see that these ideas naturally lead us into the world of decimal numbers. But before we head down that path, lets take a quick detour to tal
数学英语
by Jason Marshall In the last article, we began talking about mathematical sequencesin particular, a type of sequence known as an arithmetic sequence. Today, were going to turn our attention to another type of sequence called a geometric sequence. In
数学英语
By Peter Fedynsky Washington, DC 16 June 2006 watch Auto Workers report One of America's major labor organizations, the United Auto Workers, or UAW, held a convention this week amid signs that foreign competition will force the organization to accep
2006年VOA标准英语（六月）
The space shuttle Discovery's crew experienced a first on the shuttle's last full day in orbit. Our correspondent reports on the astronauts' welcome wake-up call Tuesday morning. If you have to wake up for work, an acoustic solo certainly beats a buz
VOA标准英语2011年(三月)
New Species Might be Human Ancestor Fossils found in a South African cave might belong to a new species of early humans that holds a unique place on the evolutionary road to modern man. On a 2008 mapping expedition in Malapa, South Africa, American p
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Harry Connick, Jr Shows Off Broadway Performances New Orleans crooner Harry Connick, Jr. was the toast of Broadway last year with a series of big band concerts now available on CD and DVD. Harry may be New Orleans born and bred, but his love affair w
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57 这种动物是人类的祖先吗？ DATE=6-13-01 TITLE=SCIENCE REPORT - Ancestor of Humans BYLINE=Jill Moss (Start at 59
科技之光
I was at the hospital at with my friend, Wendy. Her father was in an accident and she was waiting to talk to the doctor. Doctor: Hello, Im Dr. Johnson. How are you holding up? Wendy: Oh, Im fine. Is there any news? Doctor: Yes. I have examined your f
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