Once it's passed the pulmonary valve, the blood goes into the pulmonary arteries, which carry blood away from the heart to the left and right lung.

一旦血液通过肺动脉瓣，便会进入肺动脉；肺动脉将血液从心脏输送到左肺和右肺。

The second heart sound " dub" , or S2, originates from the closing of the aortic and pulmonary valves, right after the ventricles have ejected the blood.

第二心音“dub”， 即S2，是心室射血之后由于主动脉瓣和肺动脉瓣关闭产生的。

When this right ventricle contracts, it forces the pulmonary semilunar valve to open, allowing a rush of blood into the pulmonary trunk, which is the large artery that leaves the right ventricle.

右心室收缩时，它会迫使肺半月瓣打开，从而使血液涌入肺动脉，后者是离开右心室的大动脉。