于O3△&TA夏VB2 FOR Definition(2020) ANIC OBSTRUCTIVE LUNG DISED Chronic Obstructive Pulmonary Disease(COPD)is a common,preventable and treatable disease that is characterized by persistent respiratory symptoms and airflow limitation that is due to airway and/or alveolar abnormalities usually caused by significant exposure to noxious particles or gases and influenced by host factors including abnormal lung development.Significant comorbidities may have an impact on morbidity and mortality. Definition(2020) • Chronic Obstructive Pulmonary Disease (COPD) is a common, preventable and treatable disease that is characterized by persistent respiratory symptoms and airflow limitation that is due to airway and/or alveolar abnormalities usually caused by significant exposure to noxious particles or gases and influenced by host factors including abnormal lung development. Significant comorbidities may have an impact on morbidity and mortality