It can be passed all round the organization delivers pectoral wall , be like will stethoscopic put in pectoral wall certain place , can hear 它可通过四周组织传递到胸壁，如将听诊器放在胸壁某些部位，就可以听到。
2.
Will stethoscopic wall of bosom of the area before be being put to the heart , audibility every normal cardiac cycle by " dong " , " da " two composition 将听诊器放至心前区胸壁，可听到每个正常心动周期由“咚“ 、 “哒“两声组成。
