标签：diarrheal 相关文章

VOA标准英语2011--Rotavirus Kills 500,000 Children Annually Despite Vaccine

Rotavirus Kills 500,000 Children Annually Despite Vaccine Vaccines against rotavirus, a leading cause of diarrhea-related deaths among young children, first became available in 2006. However, a new study indicates vaccination has been slow to blunt t

发表于:2019-01-14 / 阅读(60) / 评论(0) 分类 VOA标准英语2011年(十月)
最新学习文章
热门学习文章