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。

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Visualize their negative words and actions bouncing off this wall like arrows on a stone fortress. They simply fall to the ground.

把他们负面的言辞和行为想象成射在铜墙铁壁上的箭。

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The leftover parts from the mold-the plastic that fills the channels that take the hot plastic into the piece negative-fall down the machine, gets ground up, and put back into the production cycle.

塑料热成型之后的残余物会自机器上掉落下来，被碾碎，并重新进入生产循环过程中。

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Remember, you've got to keep track of the sign of acceleration, so if you're picking up speed towards the ground, a is negative, so it will be g plus a, but a is a negative number.

记住,一定要注意加速度的符号,所以当你加速下降的时候,a 是负的,还是 g 加上 a,但是 a 是负数

耶鲁公开课 - 基础物理课程节选

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