(of water, oil, etc. 水、油等 moved through pipes, etc. under pressure （通过水管等）液压的，水力的 hydraulic fluid 液压液体
(of a piece of machinery 机器 operated by liquid moving under pressure 液压驱动的 hydraulic brakes 液压制动器
connected with hydraulic systems 与水利（或液压）系统有关的 hydraulic engineering 水利工程
Word Originearly 17th cent.: via Latin from Greek hudraulikos, from hudro- ‘water’ + aulos ‘pipe’.