First-degree AV block is when the signal is delayed, but still makes it to the ventricles.

一度房室传导阻滞是指电信号发生延误，但仍然都能传导至心室。

An atrioventricular or AV block is used to describe when the signal is delayed or blocked when it's trying to move from the atria to the ventricles.

房室传导阻滞是指当电信号由心房传导至心室时发生延误或阻滞。