Found outside Baghdad, Iraq in 1936, the Baghdad Battery is a small clay jar containing an iron rod suspended in a copper cylinder which is soldered shut and sealed with asphalt.
1936年在伊拉克巴格达郊外发现的巴格达电池由一根小铁棍悬空在一个由沥青密封的铜制容器中，该容器置于一个陶土罐里。
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。
Acccording to the problems in the motion transmission mechanism, the advantage of gear rod and cylinder rod mechanism are discussed.
针对给板机构传动中存在的问题，论述了采用齿轮-连杆机构、摆缸-连杆机构来实现给板传动的优越性。
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