研究具有有限惯性、并有局部富集条件下颗粒的碰撞率是目前两相流体力学和气溶胶动力学的研究热点之一。
Research on collision rate of finite inertial particle with preferential concentration is one of hotspots in gas-particle flow mechanism and aerosol dynamics.
当提到死亡率，马路上最危险的碰撞事故不是被另一辆车从正面撞击或是从侧面撞击成T字型，是单车碰撞事故。
When it comes to fatality rates, the most dangerous collision on the road isn't getting rammed head-on by another car or T-boned from the side.
他们必须放慢速度到每小时19英里左右，万一发生碰撞事故，人员死亡率低于5%。
They must slow down to about 19mph, a speed that, in case of collision, kills less than 5%.
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