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，详情可参考Line官方版本下载
4270mm 的车长，配合 1635mm 的车高，轮廓圆润。加上海苔绿、橡果棕这些低饱和度的车漆颜色，它营造的是一种人畜无害的亲和力。短前后悬、四轮四角的布置，很容易让人联想到欧洲街头常见的精品小车。
The efficiency depends on the query size relative to the data distribution. A small query in a sparse region prunes almost everything. A query that covers the whole space prunes nothing (because every node overlaps), degenerating to a brute-force scan. The quadtree gives you the most benefit when your queries are spatially local, which is exactly the common case for map applications, game physics, and spatial databases.，这一点在夫子中也有详细论述
优化：随机选基准避免最坏情况 O(n²)，更多细节参见快连下载安装
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