做功行程：当活塞到达压缩行程的上止点时，火花塞产生电火花。
Power stroke. As the piston reaches TDC on the compression stroke, an electric spark is produced at the spark plug.
进气行程，活塞下行；压缩行程，活塞上行；做功行程，活塞下行；排气行程，活塞上行。
The piston travels down on the intake stroke, up on the compression stroke, down on the power stroke and up on the exhaust stroke.
针对金刚石两面顶液压机吨位高、做功行程小、保压时间长的特点，介绍了一种新型节能两面顶金刚石液压机。
Due to the features of advantageous like high capacity, short working stroke, long holdup time, a novel energy - saving hydraulic press is presented.
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