单词：electric whistle
单词：electric whistle 相关文章
By Carol Pearson Washington 28 February 2007 watch Antibiotic Resistance report Penicillin and Erythromycin are examples of antibiotics that used to be one-time miracle cures. These drugs and other antibiotics are now less effective because bacteria
2007年VOA标准英语（二月）
By Carolyn Weaver Kampala, Uganda 03 May 2006 watch Drug Resistance report Anti-microbial resistance -- germs becoming resistant to medicine -- is part of the natural history of infectious disease. No
2006年VOA标准英语（五月）
By David McAlary Washington 10 January 2007 One of the main weapons to prevent mother-to-child transmission of the AIDS virus during birth is the drug nevirapine. But when nevirapine is used alone just once, HIV starts becoming resistant to it. Rese
2007年VOA标准英语（一月）
By Dan Robinson Washington 10 January 2007 watch Bill Rodgers Iraq report Majority Democrats in Congress are signaling they intend to put up strong resistance to any troop surge in Iraq proposed by President Bush in his speech Wednesday. VOA's Dan R
2007年VOA标准英语（一月）