液压是指升降机在升降过程中的动力来源及传动方式，液压传动固然离不开最重要的部位—液压油缸。
Hydraulic pressure refers to the lift in the process of power source and transmission, hydraulic transmission is the most important part of the hydraulic cylinder.
拖吊车，救援车：修复或救助失事船只的人、交通工具或装置，尤指一种装有升降机和牵引装置的卡车，用来拖拉报废或毁坏了的交通工具。
A person, vehicle, or piece of equipment employed in recovering or removing wrecks, especially a truck with a hoist and towing apparatus used in towing disabled or wrecked vehicles.
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