以桨叶扬起下坠碰撞问题为研究对象。
引入弹性恢复系数法描述砂粒间碰撞问题。
The restitution coefficient was applied to describe the impact problem.
但由于柔性体碰撞问题的复杂性，目前的研究还有待深入。
The impact problem about flexible bodies has not deeply investigated because of its complexity.
颗粒高速碰撞问题是冲击动力学领域中的一个重要研究方向。
Particles impacting at high velocity is a very important research direct in impact dynamics field.
道路交通碰撞是该区域国家的一个主要卫生问题。
Road traffic collisions are a major health problem in countries in the Region.
因此，对空中飞行碰撞风险问题进行研究是非常必要的。
因此，双层公路客车的碰撞安全性问题已经受到行业内外的普遍关注。
Therefore, the crash safety of double-decker coach has been attracted extensive attention.
在对孤子问题的研究中，多孤子碰撞是研究的一个重要课题。
In the study of solitons, the multi-soliton collision is an important issue.
LED灯不易碎，在碰撞时不会有问题，很适合在农场使用。
LED is not fragile, no trouble if it meets with collision, very good for farming.
下次我再遇到有新的外国朋友在这语言文化上的问题，“文化上的碰撞”我会施以援手！
Next time I have culture shock , I'll just find another new foreigner to help!
下次我再遇到有新的外国朋友在这语言文化上的问题，“文化上的碰撞”我会施以援手！
Next time I have culture shock , I'll just find another new foreigner to help!
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