对那些在一个连最自发的绳球比赛都要精确记分的体育时代里长大的人来说，不记分的比赛显得完全是激进的。
For those who grew up in a PE era when even the most spontaneous match of tetherball was scrupulously tallied scoreless play seems downright radical.
一根弹性绳把一只皮球拴在一块叶片上当球飞离叶片时，球失去能量。
A rubber ball attached to a paddle by an elastic string loses energy as it flies away from the paddle.
球绳模型SPT动态算法是已知的动态算法中最优的，但其仅局限于权值更新。
The BS Model algorithm is the best in known dynamic SPT algorithms, but it only ADAPTS to the changes of weights.
因此，借鉴球绳模型的相关思想，提出了一种在图的拓扑发生变化后对SPT进行动态更新的解决方案，并结合球绳模型SPT动态算法，完成了一种基于球绳模型的SPT完全动态算法。
Referred to the Ball-and-String Model and united with the BS model SPT dynamic algorithm, a full dynamic SPT algorithm is worked out which can update a SPT after topology changes happened.
因此，借鉴球绳模型的相关思想，提出了一种在图的拓扑发生变化后对SPT进行动态更新的解决方案，并结合球绳模型SPT动态算法，完成了一种基于球绳模型的SPT完全动态算法。
Referred to the Ball-and-String Model and united with the BS model SPT dynamic algorithm, a full dynamic SPT algorithm is worked out which can update a SPT after topology changes happened.
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