Results The adhesion, disturbance, lodge, and squamous metaplasia of cilia in tracheal epithelium; and vacuolar degeneration in epithelium cells were observed.

• 结果气管上皮纤毛粘连、乱、伏及鳞状化生,上皮细胞空泡变性,并可见新生的纤毛上皮细胞。