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个肢体电极作为正极，并取另两个肢体电极输入的平均值作为零参考。

All right as a quick recap - In a standard ECG there are 10 electrodes - four limb electrodes and six precordial electrodes that wrap around the chest.

得！快速回顾一下：标准的心电图检查需要10个电极，位于肢体的4个电极和位于胸部心前区的6个电极。

The reference negative value is the same for all chest leads and is calculated as the average of inputs from the three limb electrodes.

所有胸导联的参考负值相同，等于三个肢体电极输入的平均值。

In a standard ECG there are 10 electrodes - four limb electrodes, one on the left arm, right arm, left leg, and the right leg, and six precordial electrodes - V1 through V6 that wrap around the chest.

标准的心电图检查需要10个电极，4个位于肢体的电极，分别位于左臂、右臂、左腿、右腿，6个位于心前区的电极，从V1到V6，排列在胸部。