Recent studies suggested that erythromycin may be effective in prophylaxis against pertussis in exposed, susceptible persons.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.Whooping cough is a serious respiratory disease caused by Bordete...
Even the mantel above the fire glowed white.甚至炉火上方的壁炉台都泛着白光。On the mantel were photographs of a man and a woman.壁炉架上面是一对男女的一些照片。the mantel of a fireplace壁炉的炉台He had thrust his chest out, supporting his shoulders against ...
罗素学识渊博, 通晓的学科之多大概是20世纪学者们少有的.Russell knowledgeable, proficient in the subject as much as about the 20 th century scholars rare.他还发明了描述这种 分步 线路的标记法: 即现在通晓的流程图.He also invented a notation for describing this step - wise ci...
属于这类物质的有云母 、 瓷器 、 石英 、 玻璃 、 木材等等.To this class of substance belong mica, porcelain, quartz, glass, wood, etc.沥清铀矿和铜铀云母比纯铀的放射性强得多.Pitchblende and chalcolite are much more radioactive than uranium itself.它不能通过云母这样的不透水的物质.I...