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.
Purple: Space terms
，这一点在旺商聊官方下载中也有详细论述
`@receiver newKeywordPart: `@arg1 staticPart: `@arg2Or even swap them:
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