单词：ecdysteroid
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This is Scientific American's 60-Second Science. I'm Steve Mirsky . Got a minute ? Athletes have obviously been tempted to use performance enhancing anabolic steroids. Drug testing may discourage such use. But a new study finds that some of the perfo
Scientific American(九)月
By David McAlary Washington 23 May 2006 Chickens at US farm Scientists have developed an efficient, cheap way to vaccinate birds against avian influenza and possibly prevent the spread of the deadly H
2006年VOA标准英语（五月）
By Carol Pearson Washington 28 March 2007 watch Stent Study report A new, landmark study finds heart stents devices used to open blocked arteries - may not be as effective in the long term as medication in preventing heart attacks. VOA's Carol Pears
2007年VOA标准英语（三月）
By Tony Budny Washington 01 October 2007 U.S. law enforcement officials last week announced their largest crackdown ever on performance enhancing drugs. The nationwide raid calls attention to what officials say are the dangers of steroid use among pr
2007年VOA常速英语（十月）
1. Republican presidential nominee Mitt Romney will give a major foreign policy speech Monday when he visits Virginia Military Institute. Romney is expected to say that it's time to change course in the Middle East. 2. Federal health officials say th
美联社新闻一分钟2012(十月)
New Study Could Change Treatment for Asthma Global treatment guidelines for asthma could change as a result of a study led by a researcher at the University of Texas Medical Branch. Most adults who have mild or moderate asthma are told to use their i
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