Method:The model of pregnant rat with IUGR was established by passive smoking method.
方法：被动吸烟法建立孕鼠IUGR妊娠模型。
Method: Pregnant rat model with IUGR was established using passive smoking method.
方法：被动吸烟法建立IUGR孕鼠模型。
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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