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

然后，所有血液首先经过三尖瓣，它是将心房、心室分开的房室瓣膜之一。

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，血液穿过第二个房室瓣膜，称为二尖瓣，进入左心室。

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

当主动脉瓣和肺动脉瓣都关上后，房室瓣再次打开，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" .

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

S1, caused by the atrioventricular valves closing, at the beginning of systole, and S2, caused by the aortic and pulmonary valves closing, at the beginning of diastole.

S1是由于房室瓣的关闭导致的，发生在收缩早期；S2是由于主动脉瓣和肺动脉瓣的关闭导致的，发生在舒张早期。

In this form, the great arteries still connect to the wrong ventricle, but it's just that the ventricles are the one's that switch places along with their atrioventricular valves.

在这种构造中，大动脉仍然连接着错误的心室，只是心室和房室瓣是一起交换位置的。