从9月开学，到11月这2个月，一直在帮助她适应集体生活，也坚持送往幼儿园，没有缺席过一次。
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51吃瓜中也有详细论述
It added it was not broadcast during or around children's programming or content likely to appeal to under-16s.
Identify SERP Features and Questions related to each
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