活塞是一个中空的圆柱体形状部件，其在发动机气缸里做上下往复运动。
The piston is a cylindrical shaped hollow part that moves up and down inside the engine cylinder.
活塞是柴油机工作条件最苛刻的部件之一，它在高速往复运动中传递着整个柴油机的原动力，承受着极高的机械负荷和热负荷。
As one of the most stringent components in diesel engine, piston transfers the driving force during its high-speed reciprocating motion and withstands high mechanical load and thermal load.
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