Now, all that blood then goes through the first of two atrioventricular valves that separate the atria from the ventricles.

然后，所有血液首三尖，它是将心房、心分开的房膜之一。

After entering the left atrium, the blood goes through the second atrioventricular valve called the mitral valve into the left ventricle.

进入左心房后，血液穿第个房膜，称为尖，进入左心。

Now after both the aortic and pulmonary valves have shut down, the atrioventricular valves open again, letting the cycle start all over again.

当主动脉和肺动脉都关上后，房次打开，使心动周期重新开始。

Now once the ventricles have filled up, both of the atrioventricular valves snap shut, creating a long, loud sound that sounds a bit like “lub”.

现在一旦心被血充满，所有的房都关上了，发出一个长、响的声音，有点像“lub" 。

This so-called “group beating” can be differentiated from a type 1 second-degree atrioventricular heart block by identifying the abnormally shaped p-waves that are characteristic of an atrial ectopic focus.

所谓的“成组搏动”可以通辨认房性异位起搏点产生的异常形状的P波与度I型房传导阻滞相鉴别。