The corresponding chest electrodes serve as the positive poles.

相应的胸电极是正极。

And so there's two different poles, a negative and a positive pole here.

所以有两不同的极点，一负极和一正极。

Lead I uses the Right Arm as the negative pole and Left Arm as the positive pole, forming a vector that goes to the right.

I联将右臂作为负极，左臂作为正极，形成一指向右侧（左臂）的向量。

They use ONE limb electrode as the positive pole, and take the average of inputs from the OTHER two as the zero reference.

它们将1肢体电极作为正极，并取另两肢体电极输入的平均值作为零参考。

Thus, the position of the positive pole is the " point of view" , and the line connecting the 2 poles is the " line of sight" .

因此，正极的位置是“视角”，连接两极的线是“视线”。