I want to go back to this picture, now,

我现在想讲回这幅图
and talk about what we've learned in terms of flows.

从流体流动的角度讲讲我们学到什么
Now you can think about this in a little bit different way,

你可以以另一种方式来想想
that if there's flows going through here and here,

血液流到了这里和这里
how much goes each direction,

每个方向上流量的多少
depends on the relative resistance between this vessel and this vessel.

取决于血管和血管之间的相对阻力
It does depend on the relative size between this vessel and this vessel,

实际是取决于血管与血管之间的相对大小
but it depends on

也取决于血流下游
the relative resistance of the whole network after it as well.

整个网络的相对阻力
It depends on the whole resistance--even if you have a big tube here,

它取决于总阻力即使这里有一条粗管
if it's feeding lots of very constricted tubes down here,

如果要下游有很多较细的管道
the overall resistance that the fluid experiences at this branch point

那在这个方向上的分支点处