单词:variolovaccine
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SCIENCE REPORT - February 28, 2002: Blood Test For Ovarian Cancer By Nancy Steinbach This is the VOA Special English Science Report. American medical researchers say they have developed a simple blood
EXPLORATIONS - September 4, 2002: Rio Grande, Part 2 By Oliver Chanler (Photo - Ken Osborn/U.S. Geological Survey) VOICE ONE: This is Shirley Griffith. VOICE TWO: And this is Steve Ember with the VOA
EXPLORATIONS -August 28, 2002: Rio Grande, Part 1 By Oliver Chanler VOICE ONE: This is Shirley Griffith. VOICE TWO: And this is Steve Ember with the VOA Special English program, EXPLORATIONS. Today we
By Carol Pearson Washington 18 May 2007 The technology that helps drivers to navigate roads and soldiers to map their positions is now helping doctors repair worn-out knees. The medical procedure is called navigational knee surgery. VOA's Carol Pears
WASHINGTON D.C. The 19th International AIDS Conference drew to a close in Washington, D.C., on Friday. Under the banner of Turning the Tide Together, more than 20,000 delegates attended the six-day gathering, where speakers ranged from famous enterta
RIO DE JANEIRO, May 26 (Xinhua) -- Second-half wonder goals from Fabricio and Datolo earned Internacional a 3-3 draw against Flamengo in the Brazilian championship on Saturday. An Airton strike and Ronaldinho penalty had given Flamengo a 2-0 lead aft