撞在前进中的活塞上的分子，会加速反跳。
A molecule striking an advancing piston recoils with increased speed.
活塞横向运动加速度的峰值增加了38%，加剧了活塞对气缸的冲击。
The piston transverse acceleration peak value is raised by 38%, which brings (about) stronger shock to cylinder.
又通过发动机机体表面振动加速度，确定活塞敲击噪声产生的根源在于活塞与缸套的碰撞冲击。
It has also been clear that the source of piston knock noise is the impact between piston and cylinder sleeve by the vibration acceleration of the engine's body surface.
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