The optimal layout problem of circle group in a circular container with performance constraints of equilibrium belong to NPhard problem.
带平衡性约束的圆集在圆容器内的布局优化问题，属于NP困难问题。
Two circle round hole hammer body through the distance between the meet collision equilibrium condition.
两锤体圆透孔圆心之间的距离满足碰撞平衡条件。
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