The working principle is similar to that of the ordinary hydraulic cylinder, with a manual jack, Jack is also the simplest oil cylinder.

工作原理与普通的液压油缸基本相似，拿一个手动千斤顶来说，千斤顶其实也就是个最简单的油缸了。

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The micro motion drive unit is a highly refined screw-driven hydraulic jack.

微形传动装置是一个极精制的螺杆用液压作动筒。

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Hydraulic jack including hydraulic press and hydraulic press.

液压千斤顶包括水压机和油压机。

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Much greater pressure can be produced by using a machine, a hydraulic jack.

VOA: special.2009.09.29