jack (device)中文什么意思

千斤

• jack:     jack3 n. 1.( ...
• device:    n. 1.设计，计划；方法，手段。 ...
• jack:     jack1 n. 1.〔 ...

百科释义

A jack is a mechanical device used as a lifting device to lift heavy loads or apply great forces. Jacks employ a screw thread or hydraulic cylinder to apply very high linear forces.