以下为句子列表：
英文: 1984 Scientists reported that an effective chicken pox vaccine had been developed. The disease claimed some 100 to 150 lives in the U.S. each year.
中文: 科学家们报道：已经制成一种有效的水痘疫苗。美国每年约有100人到期150人死于水痘病。
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英文: A large multicenter vaccine trial showed a consistent decrease in hospitalizations and emergency department (ED) visits for gastroenteritis caused by rotavirus (RV).
中文: 一个大规模的多中心疫苗试验显示由轮状病毒引起的住院和急诊胃肠炎病人均明显较少。
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英文: A prophylactic agent, device, or measure, such as a vaccine or drug.
中文: 预防剂预防性的物质、器具或措施，比如疫苗或药物
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英文: A vaccine against four strains of Neisseria meningitidis is available, but it is not given routinely.
中文: 目前已有一种防治四种奈瑟菌脑膜炎的疫苗，但不会例行提供。
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英文: A vaccine is not yet available.
中文: 答:暂时没有预防疫苗。
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