On a 2-stroke engine, the upward stroke is the compression stroke.
在2冲程发动机，向上中风是压缩行程。
This upward leader connects with the downward leader and a return stroke occurs. Five more dart leader-return strokes follow.
上行先导与下行先导连接，于是产生了一次回击，随后又是五次以上的直窜先导型回击。
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。
应用推荐