例句與造句

1. Image showing the cardiac pacemaker or SA node, the normal pacemaker within the electrical conduction system of the heart.
2. Ectopic ( from the Greek " ektopos ", meaning " out of place " ) refers to the fact that the ventricles are being triggered by tissue that is not the normal pacemaker tissue within the heart.
3. It's difficult to find normal pacemaker in a sentence. 用normal pacemaker造句挺難的