They have this streamlined sternum with lower sternal keels.

它们拥有流线型的骨，龙骨突较低。

Birds with a deep sternal keel fly more slowly, those with long sternums are associated with running birds.

龙骨突深的鸟飞得更缓慢，而骨长的鸟则大多走禽。

Also, that blood flowing through a VSD can be heard as a holosystolic murmur at the lower left sternal border.

并且，血液流经VSD时，下骨边缘听诊就会听到全收缩期杂音。

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，你将听诊器放到第二肋间隙，骨上缘，你将听到肺动脉瓣关闭的声音。

As the blood flows in the reverse direction, the murmur is best heard not in the aortic area, but rather along the left sternal border.

当血液流向相反方向流动时，杂音最响部位不主动脉区域，而沿着骨缘。

On the other side of the heart, a tricusoid valve regurgitation has similar timing and shape, but it is loudest in the tricuspid area and the sound radiates up, along the left sternal border.

心脏的另一边，三尖瓣反流有着相似的时间和形状，但三尖瓣位置声音最大，沿着骨边缘向上放射。