鲜有学校老师可随心所欲地教书的情况。Rarely do schoolteachers have leeway to teach classes the way they want.他靠教书与从事新闻工作谋生。He made his living by a mixture of tutoring and journalism.他已经厌烦了在州立大学教书。He had wearied of teaching in state univers...
最近的研究提示,红霉素对暴露于百日咳的易感者,在预防上有效.Recent studies suggested that erythromycin may be effective in prophylaxis against pertussis in exposed, susceptible persons.各抗生素平均耐药率由高向低依次为:氧氟沙星 ( Ofl)87.4%,红霉素 ( Ery ) 59.2%, 环丙沙星 ( Cip )...