HEADS是同陆军合作开发的，该系统在可能导致脑部受伤的冲击和爆炸过程中，帮助科学家们分析和理解的士兵所承受的外力。
Developed in cooperation with the Army, HEADS will help scientists analyze and understand the forces soldiers sustain during impact and blast events that could lead to brain injury.
若没有外力，作用于系统整体，在碰撞过程中，动量就是守恒的。
And if there is no net external force on the system as a whole during the collisions, then momentum is conserved.
这一过程是每个线棒既不依靠外力也不涉及和影响其他线棒的自我调节和平衡过程。
This is a process that each bar can manage self-adjustment and balance without any external forces and influence on other bars.
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