That's a feature of our circulatory system.

这是人体循环系统的一个特征
If I want more blood to go to the brain

如果想要更多的血液流向脑部
there's two ways to get more blood to the brain.

有两种方法能做到这一点
Well, there's more than two ways,

嗯其实方法不止两种
but two ways as long as the pressure--blood pressure stays the same.

但在血压保持不变的条件下只有两种
One way is to dilate the vessels of the brain to

一种方法是扩张脑部血管
create less resistance there.

降低它们的阻力
The other way is to constrict the vessels somewhere else

另一种方法是收缩其它部位的血管
to create more resistance there.

以产生更大的阻力
Either one of those is going to get me more flow to the brain.

这两种方法都可以使脑部血流量增大
Because it's a closed system,

因为循环系统是封闭的
everything is interconnected

所有部分都有内在联系