1. Animal modeling material: Monkey; Medication: SO2; Equipment: fumigation box.
2. Modeling method: Model animals inhale 5-8ml/10L of SO2 air for 2 hours a day, 5 times a week, for 65 days.
3. The principle of modeling is to establish a chronic bronchitis model by inhaling SO2 to cause tracheal injury and inflammation in animals.
4. Changes after modeling: After 50 days of modeling, the animal glands significantly proliferated and chronic bronchitis lesions appeared.