现如今国内没有针对大客车的碰撞安全性的强制性法规，当然也没有具体的翻滚碰撞实验。
Nowadays, obliged regulations on collision safety of bus has not been carried out in China, of course, experiments about roll-over collision have not been done.
为了解决上述问题，在碰撞前后设置了一碰撞缓冲区，采用了变步长的方法强制计算点在跳过此缓冲区时必须进入该区。
To solve this problem, impact buffer area is inserted just before the impacting occurs. When jumping over this area, computation must go through this area by alterable steps.
为了解决上述问题，在碰撞前后设置了一碰撞缓冲区，采用了变步长的方法强制计算点在跳过此缓冲区时必须进入该区。
To solve this problem, impact buffer area is inserted just before the impacting occurs. When jumping over this area, computation must go through this area by alterable steps.
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