The QRS wave, which is sometimes called the QRS complex, represents the spread of the electrical impulse through the ventricles, or ventricular depolarization.

QRS波，有时被称为QRS波群，代表电脉冲通过心室的传播，或心室去极化。

On an ECG, we would see an increased distance or time between the P wave and the Q part of the QRS wave.

在心电图上，我们会看到P波和QRS波Q部分之间的距离或时间增大。

The reason for this increased distance or time is because the P wave represents contraction of the atria and the QRS wave represents contraction of the ventricles.

距离或时间增加的原因是P波代表心房收缩，QRS波代表心室收缩。

A normal ECG has three distinct waves, and we call them the P wave, QRS wave, and the T wave, and you notice that they follow in alphabetical order.

正常的心电图有三种不同的波，我们称之为P波、QRS波和T波，你注意到它们是按字母顺序排列的。