心脏射血时主动脉不能完全膨胀，动脉内骤增的血容量得不到缓冲，导致收缩期

When the heart is ejected, the aorta cannot be fully expanded, and the sudden increase in blood volume in the artery is not buffered, resulting in an increase in systolic blood pressure, and a relatively low diastolic pressure, resulting in an increase in pulse pressure difference.

The aorta does not expand completely when the heart is shot, and the blood volume of the sudden increase in the artery is not buffered, resulting in increased blood pressure during the systolic period, while diastolic pressure is relatively low, resulting in an increase in pulse pressure.

During the cardiac ejection, the aorta could not fully expand, and the blood volume in the artery could not be buffered, resulting in the increase of systolic blood pressure, while the diastolic pressure was relatively low, resulting in the increase of pulse pressure difference.