Cardiac axis is the net direction of electrical activity during depolarization.

心电轴是去极化过程中电活动的净方向。

Cardiac axis can be determined by examining the 6 limb leads, which look at the heart from different angles in a vertical plane.

心脏轴可以通过检查6个肢体导联来确定，这些导联在垂直面上从不同角度观察心脏。