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VOA标准英语2014--New Vaccine Research Aimed at Cattle Killer 新疫苗研究意在对付牧牛杀手

New Vaccine Research Aimed at Cattle Killer 新疫苗研究意在对付牧牛杀手 New research is underway to develop an advanced vaccine against East Coast fever a parasitic disease that killed more than one-million cattle in Africa last year. Res

发表于:2018-12-16 / 阅读(30) / 评论(0) 分类 VOA标准英语2014年(二月)
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