The bright return stroke travels upward at around half the speed of light, and is too fast to capture in more than one image.
闪亮的回击以光速的一半速度上行传播，由于它的速度太快，在一张图象中不能捕捉到这一过程。
The fluted disc on the connecting sleeve is contacted and glide with the diagonal face to form zero return stroke. The speed of tweaking screws is high.
斜面与联接套的齿盘接触可滑动，形成空回程，扭螺丝速度快。
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