单词：imnunologist
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By Deborah Tate Capitol Hill 28 February 2007 The Bush administration is stepping up its campaign to get the Democratic-led Congress to approve its immigration reform plan, which failed to get approval from the Republican-dominated Congress last year
2007年VOA标准英语（二月）
By Michael Bowman Washington 29 June 2006 The Bush administration says it is taking effective steps to stem illegal immigration to the United States, but Congress must act to overhaul America's immigration system. Homeland Security Secretary Michael
2006年VOA标准英语（六月）
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This is Scientific American's 60-Second Science, I am Karen Hopkin. This'll just take a minute. Biologists, traditionally track migrations by tagging animals with devices that allow their movements to be monitored. But Homo sapiens can't be fitted wi
Scientific American(六)月
By Carol Pearson Washington, DC 08 November 2006 watch Heart Stent report Heart stents are lifesaving medical devices that help prevent heart attacks. Most of these stents are coated with various drugs, but mounting data suggest drug-coated stents c
2006年VOA标准英语（十一月)