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Chronic obstructive pulmonary disease (COPD) is a chronic bronchitis and/or emphysema characterized by airflow obstruction, which can further develop into a common chronic disease of pulmonary heart disease and respiratory failure. It is related to the abnormal inflammatory response of harmful gases and particles, and the disability rate and mortality rate are very high. The global incidence rate of over 40 years old has reached as high as 9% to 10%.