splitting of heart sounds

例句：

1. 1. The doctor suspected that she had a heart murmur.
   医生怀疑她有心脏杂音。
2. 2. After the operation, the patient's heart murmur disappeared.
   手术后，患者的心脏杂音消失了。
3. 3. The splitting of the heart sound was caused by a rare genetic condition.
   心脏杂音的分裂是由一种罕见的遗传病引起的。