Simplify the following text for a Grade 12 native English-speaking person.
Original: Hydraulic lifts use the principles of hydraulics ( in the sense of hydraulic power ) to pressurize an above ground or in-ground piston to raise and lower the car ( see Hydraulic elevators below ) .
Simplified: Hydraulic lifts use the principles of hydraulics ( in the sense of hydraulic power ) to pressurize an above ground or in-ground piston to raise and lower the car .