为了应用概率统计规律解决机械阻力问题，分析了颗粒碰撞过程及相对距离、颗粒个数及碰撞方向。

This paper tries to resolve the problem of mechanical drag force by the rule of probability and statistics.

youdao

安全气囊在碰撞时立刻膨胀，在司机和方向盘之间形成一个缓冲。

Airbags inflate instantaneously on impact to form a cushion between the driver and the steering column.

《柯林斯英汉双解大词典》

我不改变质量，我要改变的只是，碰撞的方向。

I don't change the masses, but I just am going to change the direction of the impact.

youdao