Piston
01
活塞, 柱塞
a solid, round part that moves back and forth inside a hollow tube in an engine or machine, helping to push or pull gases or liquids, or to turn pressure into movement
例子
The piston moves up and down inside the engine.
活塞在发动机内部上下移动。
Steam pushes the piston to power the machine.
蒸汽推动活塞为机器提供动力。
