So pacemaker cells are, in a way, your heart's very own brain, generating the initial spark that sends a current through your heart's internal wiring system, known as the intrinsic cardiac conduction system.

所以起搏细胞在某种程度上是心脏自己的大脑，产生最初的火花，通过心脏的内部线路系统发送电流，被称为内在心脏传导系统。

As stated, a slow heart rate can be normal and healthy, but it can also be a sign of a disease that damaged or slowed the heart's electrical system or a result of taking a medication.

如前所述，缓慢的心跳既正常又健康，但这也可能是一种疾病的信号，它损害或减慢了心脏的电系统，或者是服用药物的结果。