Methods: A rat model of COPD was established by passive smoking and instillation of Porcine Pancreatic Elastase (PPE) into the airways.
方法：通过被动吸烟和气道注射猪胰弹性蛋白酶（PPE）建立COPD大鼠模型。
Methods: A rat model of COPD was established by passive smoking and instillation of Porcine Pancreatic Elastase (PPE) into the airways.
方法：通过被动吸烟和气道注射猪胰弹性蛋白酶（PPE）建立COPD大鼠模型。
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