COPD
noun [ U ] medical specialized uk/ˌsiːˌəʊˌpiːˈdiː/ us/ˈsiː.oʊˌpiːˈdiː/
慢性阻塞性肺炎（chronic obstructive pulmonary disease的缩写）
abbreviation for chronic obstructive pulmonary disease: a lung disease that makes the lungs work less well and lasts for a long time
Smoking is the major cause of COPD. 吸烟是造成慢性阻塞性肺炎的主要原因。