单词:minimum erythema dose
最小红斑照射量
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US four-man bobsled team, captured gold medal Saturday at Vancouver Winter Games Parke Brewer | Whistler Sliding Center, BC, Canada 28 February 2010 Photo: ASSOCIATED PRESS The United States' USA-1,' with Steven Holcomb, Justin Olsen, Steve Mesler, a
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VOA标准英语2010年(三月)