This means that the SA node essentially skips one cycle of sending its own signal.

这意味着窦房结跳过了发放它自己冲动的一个周期。

One important effect of the premature depolarization is that the ectopic focus will depolarize the cells of the SA node, causing the SA node to skip a cycle.

过早除极的一个重要影响就是异位起搏点将会使窦房结细胞除极，导致窦房结跳过一个心动周期。