The collision momentum of condensed particles has little relation with the injection nozzle configuration under the same primary nozzle equivalent diameter.

在相同的一次喷嘴当量直径条件下，凝相颗粒的碰撞动量与喷嘴结构之间的关系不大。

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The collision between atoms and electrons moving in a definite direction with the additional static electric field is considered to be the primary reason for the result mentioned above.

从微观机制上分析推断：外加电场使非稳态等离子体中的电子作定向运动，加剧电子与原子之间的碰撞是上述结果的主要原因。

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But in recent years, interest shifted to collision avoidance, hence the focus on driver behavior, the primary cause of most crashes, Dr. Campbell said.

FORBES: Crash Study Seeks Participants In Effort To Save Lives