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This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. The plague is most famous for killing tens of millions of people all over Europe in the 1300s. Plague is caused by the bacteria Yersinia pestis. And th
Scientific American(八)月
He is immune to chickenpox, he had it as a child. 他对水痘免疫，他小时候就得过了。 immune表示免疫的，immune system就是指身体的免疫系统；而对...有免疫力就用be immune to...这个词组。
蒋健棠英语实用句子
By Nancy Steinbach Broadcast: August 20, 2003 This is Bill White with the VOA Special English Health Report. The World Health Organization says medical progress against disease will have no effect if
VOA2003（下）-环境与健康
Researchers have developed an improved version of the smallpox vaccine that can be combined with a vaccine against anthrax. The dual vaccine represents a significant scientific achievement as well as a possible improved defense against biological att
VOA标准英语2010年(十)月
今天我们要学的词是immune。Immune, 的意思是免疫的，比如，immune system就是指免疫系统， immune disease则是免疫系统疾病。Immune还可以指免除的,不受影响的. Apple's OS X, which has long been considered immu
英语单词荟萃
RIGA, May 14 (Xinhua) -- Chinese Defense Minister Liang Guanglie here on Monday met his Latvian counterpart Artis Pabriks, with both sides pledging to enhance bilateral military cooperation. During the meeting, Liang said that China attaches great im
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