On the right side, the superior vena cava, ascending aorta, right ventricle, left ventricle, and inferior vena cava should all be visible.

在心脏右侧，分别是上腔静脉、升主动脉、右心室、左心室和下腔静脉。

Well, you will remember from our lessons on the heart that blood leaves the left ventricle through the aorta — the biggest and toughest artery in your body, roughly the diameter of a garden hose.

你应该还记得我们关于心脏的课程，血液通过主动脉离开左心室——主动脉是你体内最大最坚韧的动脉，大约有一根园艺软管的直径那么粗。

If the ectopic focus originates in the left ventricle, the wave will depolarizing the left ventricle first and then the right ventricle, which produces a QRS complex that looks like a right bundle branch block.

如果异位起搏点源于左心室，这个波将会首先除极左心室，然后是右心室，这会产生类似于右束支阻滞的一个QRS波群。

From the lungs, freshly oxygenated blood flows back into the left atrium and passively passes through the mitral or bicuspid valve to fill the left ventricle.

新鲜的含氧血液从肺部流回左心房，被动地通过二尖瓣（bicuspid valve）注入左心室。

If the ectopic focus originates in the right ventricle, the wave will depolarize the right ventricle first and then the left ventricle, and this produces a QRS complex that looks like a left bundle branch block.

如果异位起搏点源于右心室，这个波将会首先除极右心室，然后是左心室，这会产生类似于左束支阻滞的一个QRS波群。

The blood continues on its one-way path out of the left ventricle through the aortic semilunar valve, which is the valve that separates the left ventricle and the arteries leading to the body.

血液通过主动脉半月瓣继续沿其单向路径流出左心室，该瓣膜将左心室和通向人体的动脉分开。