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

VOA: special.2009.09.29

The problem is Freud had a very sort of hydraulic theory of what goes on, and some of this stuff slips out and it shows up in dreams and it shows up in slips of the tongue.

问题在于,弗洛伊德用所谓的液压理论,解释了发生的事情，有些受到压抑的欲望,会通过梦境和口误而表现出来。

耶鲁公开课 - 心理学导论课程节选

It was the center of their universe. And it was called the 'hydraulic city' because it had really remarkably massive arrays of barays, which are these giant water tanks and a series of canals and interconnected waterways that was really unparalleled in the ancient world in that part of the world."

VOA: standard.2010.04.05