[名词解释] 流行

潜伏期 呼气延长常见于 ["发热","肺炎","贫血","急性喉炎","阻塞性肺气肿"] 爆发流行 潜伏性感染 下列哪项语颤增强 ["肺气肿","支气管炎","肺炎","气胸","胸膜增厚"] 流行