when you're starting to run.

当你开始跑步的时候
Not your brain,

脑部血流不会减少
you want to keep blood flow to your brain

脑部的血液流量保持不变
so you don't run into the wall,

这样你才不会撞墙
but you might have less flow going to your digestive organs.

但可能流到你消化器官的血流量减少了
You'd stop digestion for some period or slow it down;

此时消化停止或者减缓了
provide less blood flow for that purpose.

因为用于此的血量减少了
Does that make sense?

听懂了么
Well if we look at how pressure varies through the circulatory system,

如果观察循环系统中压力的变化方式
your blood pressure is generated by the heart.

血压是由心脏产生的
Blood pressure ranges between 120/80 mmHg.

血压的范围是 120/80 毫米汞柱
We're going to see this in a few minutes

马上我们就能看到