Fluid takes the path of least resistance,

流体会从阻力最小的地方通过
some goes through but not as much, that makes sense.

有一些也通过这里但不多就是如此
Why does the overall flow through the whole circuit change?

为什么回路中总流量也改变了
Why does the overall flow through this whole thing change?

为什么回路中总流量也改变了
Well, because if any one of the vessels in here increases its resistance

因为如果这里任一条血管的阻力增加
it increases the overall resistance of the aggregate of vessels.

这一束血管的总阻力也就增加了
If the pressure that I have available is constant, and it is,

如果给定的压力保持恒定
the pressure I have available is constant in this example,

在这个例子中给定的压力是一定的
it's 1 mmHg,

是一毫米汞柱
then when the whole thing increases its resistance

那么阻力增加就意味着
that means the flow rate through the whole circuit has to go down as well.

回路中的总流量就会减小
There's two things that are really illustrated here.

这是在这里真正要说明的两个问题