pressures to be in the regions that are closest to the heart.

将会出现在离心脏最近的地方
If I measured pressure in the aorta,

如果我测量主动脉的血压
and we talked about this last time,

像我们上次说的那样
you would find that pressure varies with time.

你会发现血压随时间变化而变化
Because pressure is going up and down in the heart,

因为血压在心脏里时高时低
that oscillation in pressure with heartbeat gets transmitted into

这种血压随着心跳的上下振荡也传递到
the aorta as well and we'll talk in a minute about why that happens.

了主动脉我们马上要讲其发生的原因
If you looked over time an average pressure

如果你检视一个时间段内主动脉平均压
in the aorta would be somewhere between 120 and 80 mmHg,

基本会维持在120到80mmHg之间
so let's just call it 90 here.

我们假设这里是90吧
The pressure in the aorta is 90.

主动脉的血压是90
If you think about the whole circuit,

如果你思考一下在整个循环系统中