单词：accelerators
n. a valve that regulates the supply of fuel to the engine
n. (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected
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Yael: I just read about an exciting technique. Researchers found a way to convert types A and B blood into type O blood--the type that can be transfused into any patient. This advance could help avoid blood shortages in the future. Don: Wow, that is
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衣橱里衣服成堆，可还是觉得没有衣服穿?不如找一天来一场衣橱血拼吧。你不用花一分钱，只需把衣服全部整理一遍，就有可能会发现好几件很不错的新衣服。 Closet shopping is a kind of shopping
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【背景】 血型分类: 一般常见A、B、AB和O四种，另外还有RH、MNS、P等极为稀少的10余种血型系统。其中，AB型可以接受任何血型的血液输入，因此被称作万能受血者，O型可以输出给任何血型的人
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Broadcast: April 30, 2003 By Nancy Steinbach This is the VOA Special English Health Report. American researchers say drinking tea may help strengthen the body's defense system against infection. Docto
VOA2003（上）-健康资讯
This is the VOA Special English Health Report. Scientists may have found a way to reduce shortages of type O blood. Type O is the kind of blood that hospitals most often need. What the researchers are testing is an easier way to make type O blood ou
VOA慢速英语2007年（五）月
HEALTH REPORT - Kidney Transplants By Nancy Steinbach Broadcast: Wednesday, April 21, 2004 This is the VOA Special English Health Report. Each year, thousands of people receive organ transplants. The
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