说明改进活塞的结构，对于降低活塞碰撞冲击力和活塞敲击噪声具有一定的效果。
It is proved that the improvement of piston structure is effective to decrease the impact force and the knock noise caused by the piston.
在活塞冲击力影响因素分析的基础上，提出了降低其活塞碰撞冲击力的改进方案。
An improve plan to decrease the piston impact force is brought forward based on the analysis of factors influencing the piston impact force.
气囊用来减轻汽车碰撞的冲击力。
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