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A tram derailed and crashed into a building in Milan on Friday, killing two people and injuring 38 others.
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A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.，这一点在51吃瓜中也有详细论述
"""带重试机制的GET请求"""