The use of hydraulic cylinder in hydraulic elevator, the part usually has five parts: piston and piston rod, cylinder and cylinder head, buffer device, sealing device and exhaust device.
液压升降机中使用的液压油缸，其组成部分通常有五部分：活塞和活塞杆、缸筒和缸盖、缓冲装置、密封装置、排气装置。
As the buffer action of the elastic of the tension spring of the elastic of the fishing rod, the hook fish is difficult to escape.
由于拉簧的弹性和鱼杆本身弹性的缓冲作用，钩住的鱼不易逃脱。
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