unidirectional force造句

A "'hydraulic cylinder "'( also called a linear hydraulic motor ) is a mechanical actuator that is used to give a unidirectional force through a unidirectional stroke.
This allowed the wheel to turn some ten degrees and bring the next bucket under the stream of water while the stop fell back . . . . In the Chinese clock, then unidirectional force produced unidirectional motion.
Ingeniously, the very force that turned the scape wheel then slowed it and pushed it part of the way back . . . . In other words, a unidirectional force produced a self-reversing action about one step back for three steps forward.
It's difficult to find unidirectional force in a sentence. 用unidirectional force造句挺难的