许多产品团队并不了解自己使产品越做越好还是越做越差，所以许多消费者在需要升级或更新之前都会肝颤一下。
Most product teams don’t know if they are making their product better or worse; that’s why customers feel a twinge of fear every time they have to update or upgrade.
我们认为心房纤颤病程长，PBMV后瓣口面积小和左房回缩差是心房纤颤复发的可能原因。
It was considered that longer atrial fibrillation history, small mitral area and higher left atrial pressure after PBMV were the key factors of atrial fibrillation recurrence.
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