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。
They work with remote control devices that change the direction, position and speed of a German-made cutting machine that slices back and forth along a 300-metre-wide coal face.
他们操作的遥控装置可以改变截煤机的方向、位置和速度,这台德国产的截煤机可以沿着一道300米宽的煤面来回进行切割。
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