but I'm only going to say a few words here

我在这只谈一点点
to sort of orient you in the subject.

领你们进门而已
All membranes are electrically charged.

所有的膜都是带电的
They carry a potential, that is,

它们带有电势就是说
if you could - if you had a tiny, tiny electrical meter,

如果你能有一个足够小的电位计
you could one put one electrode on one side of the cell membrane,

可以把一个电极放在细胞膜一侧
on the extracellular side

假设放在细胞外的一侧
and one on the intracellular side and measure,

另一个电极放在细胞内侧并测量
you would measure a potential difference;

你能测到一个电势差
just like a battery you would measure a potential difference.

就像电池那样能测到电势差
That potential difference is generated by the movement of ions,

电势差是由离子运动造成的
principally sodium and potassium across the membrane.

特别是钠和钾的跨膜运动