The dynamical computing of crankshaft reciprocating-piston compressor has been using graphics or hand-computation for a long time, which means heavy working capacity and low precision.

曲轴往复活塞压缩机动力学计算，长期以来沿用着图解法或手算法，其工作量大、精确度低。

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The double acting reciprocating mud pump one time every two suction drainage action.

而双作用式泥浆泵每往复一次完成两次吸排水行动。

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Curtain-style: from between the two points, at the same time on both sides until the whole bright light followed, and then point out to the middle, followed by reciprocating.

幕布式：从中间两个点，同时向两边依次点亮直至全亮，然后再向中间点灭，依次往复。

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