noun 下载 🔗分享 立克次体 Any of a group of gram-negative bacteria, of the genus Rickettsia, carried as parasites by ticks, fleas and lice; they cause typhus and other diseases Examples : "The doctor said the child had a fever and symptoms consistent with rickettsia, possibly carried by a tick bite. " 医生说孩子发烧了,而且症状与立克次体感染相符,可能是被蜱虫叮咬引起的。 microorganism disease biology medicine organism insect science 与AI对话词汇游戏阅读练习