This lightning, a negative stepped leader, was filmed from an airplane.
这次闪电是一个负极梯级先导，它是从一架飞机上拍下的。
Eventually a negative stepped leader travels downward and reaches the ground, creating a return stroke.
最终一个下行传播的负极梯形先导接触到地面，制造了一次回击。
As the negative stepped leader gets closer to the tower, a positive leader forms from the tower tip and moves upward.
随着负极梯级先导向塔不断靠近，塔顶端的正极先导形成并且上行移动。
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