单词：McNeill
单词：McNeill 相关文章
This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute? Could the eradication of smallpox have been a factor in the spread of HIV? Thats the question posed by researchers in the journal BMC Immunology, who think that the vacc
Scientific American(五)月
Could the eradication of smallpox have been a factor in the spread of HIV? Thats the question posed by researchers in the journal BMC Immunology, who think that the vaccine might have offered partial protection against HIV. As smallpox was wiped out,
60秒科学
By Al Pessin Washington 06 February 2008 The top NATO commander in Afghanistan is disputing claims that the Taliban is experiencing a resurgence and that the recent increase in violence proves it. The commander also says the number of foreign forces
VOA常速英语2008年（二月）
By Al Pessin Pentagon 05 June 2007 The commander of NATO forces in Afghanistan says the international community is not doing enough to provide troops and a coordinated reconstruction effort to help stabilize the country. American McNeill spoke from A
2007年VOA标准英语（六月）