two milligrams per liter.

就是每公升两毫克
That's the concentration and that's the simplest way to define it.

浓度如此且是解释这个的最简单方法
Now, how can I get away with saying

现在我如何达到我所说的
that we're well-stirred?

搅拌好的那种状态呢
I indicate that in this simple drawing by having a--

我指通过一个搅拌桶中的液体的推进器
this is a propeller that's stirring the vat of liquid,

这样简单的描述
how can I get away with saying we're well-stirred?

我如何能处理好我所说的我们是搅拌好的
Well, in some senses we are,

是的在某种程度上我们是的
that's what our circulatory system does,

那是我们的循环系统做的事
and I'm going to talk about that in the weeks to come,

我将会在接下来几个星期介绍这个
but our heart is a very effective--

然而我们的心脏是一个非常有效的系统
our heart and our blood vessels are a very effective system

我们的心脏和血管利用其巨很大的容积