Before I dive, I go through a whole preparation and that will include stretching of the body, stretching of the lungs, the diaphragm, intercostal muscles.

在潜水之前, 我会做一个完整的准备活动，包括身体的伸展，肺、肌和肋间肌的拉抻。

In addition to the diaphragm, external intercostal muscles are muscles located on the outside of our ribs, and they expand the chest.

，肋间外肌是位于肋骨外侧的肌肉，它们可以扩张胸部。

Then, if you place a stethoscope in the left second intercostal space, at the left upper sternal border, you can hear the pulmonary valve closing.

然后，你将听诊器放到左第二肋间隙，在左胸骨上缘，你将听到肺动脉瓣关闭的声音。

If you place a stethoscope between the second and third rib, known as the right second intercostal space, just next to the upper border of the sternum, you’ll hear the aortic valve closing.

如果你将听诊器置于第二肋及第三肋之间，被称为右第二肋间隙；紧靠胸骨上缘，你将听到主动脉瓣关闭的声音。