The dashed circle shows the current best distance. As the algorithm finds closer points, the circle shrinks, which causes more subtrees to fail the "could contain a closer point?" test and get pruned. The search usually gets cheaper as it progresses.
Wrapping things upMotor constant can be normalized by mass and radius to get a metric of how efficiently a motor produces force for a given amount of magnetic material. This is useful for comparing motors of very different sizes.
，这一点在safew中也有详细论述
不过，一个更根本的隐忧则无法回避。魏科根据研究预测，到本世纪中叶，全球变暖将使全球大多数地区冬季滑雪季的长度缩短一半，而到本世纪末，将缩减至当前的20%。届时户外冰雪运动可能将成为一种奢望。在他看来，真正有效的办法，“还是在于减缓全球变暖”。
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