Heart disease is a worldwide problem and the leading cause of death among Americans.
心脏病是一个全球性的问题，也是美国人致死的首要原因。
Chronic obstructive pulmonary disease (COPD) is a worldwide medical problem and its mortality and morbidity have been rising every year.
慢性阻塞性肺疾病(COPD)的发病率和死亡率逐年升高，已成为世界性医学问题。
Chronic obstructive pulmonary disease (COPD) is a worldwide medical problem and its mortality and morbidity have been rising every year.
慢性阻塞性肺疾病(COPD)的发病率和死亡率逐年升高，已成为世界性医学问题。
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