Clinical investigation of the relationship between surface ECG f-f interval changes and atrial fibrillation duration and atrial electrical remodeling in the elderly with paroxysmal atrial fibrillation是什么意思_Clinical investigation of the relationship between surface ECG f-f interval changes and atrial fibrillation duration and atrial electrical remodeling in the elderly with paroxysmal atrial fibrillation在线翻译_英语_读音_用法_例句