The final step came when steam was introduced into the cylinder to drive the piston backward as well as forward, thereby increasing the speed of the engine and cutting its fuel consumption.
最后一步是将蒸汽引入气缸，使得活塞前后推动，从而提高了发动机的速度，降低了燃料消耗。
2
The core of a steamengine is a cylinder that is sealed at one end and has a moving piston at the other.
蒸汽机的核心是汽缸。它一端密封，另一端有个可以移动的活塞。
3
Reciprocating piston pump crankshaft by connecting rods connected with the original motivation. Prime mover can be motor, steamengine can also be used.