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Young children in the UK are being offered protection against chickenpox on the NHS for the first time.
For well-distributed points, nearest neighbor search is often near O(logn)O(\log n)O(logn) in practice. In the worst case (all points clustered tightly or along a line), it can degrade to O(n)O(n)O(n), but this is uncommon with typical spatial data.
典型案例六：航空基地飞机管路系统及隔热降噪零部件制造基地项目