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BNC: 35722 COCA: 17854

a condition in which the small sacs (= spaces) in the lungs become filled with too much air, causing breathing difficulties and heart problems肺气肿

Heavy cigarette smoking often causes emphysema.抽烟过多常常导致肺气肿。
BNC: 35722 COCA: 17854
BNC: 35722 COCA: 17854
BNC: 35722 COCA: 17854

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