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。
However, in a compressed air engine, no additional energy is gained if the air in the cylinder is compressed on the upward stroke of the piston.
然而，在压缩空气引擎，不需要额外的能源是涨，如果空气中的气缸压缩的向上中风活塞。
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。
This difference seems to be applied to explain the cause why the squeal only occurs in the end of the upward-stroke under reciprocating sliding.
这为解释往复滑动摩擦噪声只在向上行程末期发生的原因拓宽了视野。
The exhaust stroke continues as the piston passes BDC and moves upward to past TDC.
排气冲程随着活塞经过下止点并上行至上止点。
The exhaust stroke continues as the piston passes BDC and moves upward to past TDC.
排气冲程随着活塞经过下止点并上行至上止点。
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