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。
Voltage points and negative to ground.
电压分，负向地面。
"Black line" to connect the battery negative (Ground);
“黑线”接电瓶的负极（搭铁）；
"Black line" to connect the battery negative (Ground);
“黑线”接电瓶的负极（搭铁）；
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