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二尖瓣返流是心脏疾病最主要的发病之一。
Mitral regurgitation is one of the most serious heart diseases.
返流是第二种最常见的症状，并有大约60％的患者存在。
Regurgitation is the second most common symptom, and is present in about 60% of patients.
返流是第二种最常见的症状，并有大约60％的患者存在。
Regurgitation is the second most common symptom, and is present in about 60% of patients.
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