It's less negatively charged than it is in its resting state.

细胞膜此时比静息状态带负电减少
That happens,

当去极化发生时
and if I was looking at a region of membrane that was experiencing an

如果我观察一个经历动作电位的区域
action potential I would see voltage change

我就会看到这样的电压变化
in just the way it's shown in this graph here.

就像这幅图上展示的一样
Now, if that potential changed and it stayed changed forever,

如果电势变化并且不再恢复到原始电势
then the cell would never go back to its resting state.

细胞就永远不会回到静息状态
That would be - you could have a cell that did that

那样就会你的细胞可以发出信号
but that would be cell that could only send one signal.

但这个细胞只能发出一次信号
It sends it's signal,

它发出信号
it's signal - the signal that it sends is this change in voltage,

它通过电压的改变发出信号
and once it changes,

然而一旦电压改变