Range queries ask "what's inside this box?" But sometimes the question is "what's nearest to this location?" This is the nearest neighbor problem, and you don't know how big your search radius should be. The nearest point might be right next to you or far away.
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2月25日下午，国家主席习近平在北京钓鱼台国宾馆会见来华进行正式访问的德国总理默茨。
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