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。
The consumption period (forward or backward) is specified in workdays and is valid from the current date.
消耗期间(向前或向后)指定从当前日期起的有效工作天数。
The consumption mode determines whether consumption is to be carried out as backward or forward consumption, or whether both consumption types are allowed.
消耗模式决定消耗是向后消耗还是向前消耗，还是向后向前都允许。
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