好奇心会逼着我们学习。而对史蒂夫来说，想学习远比想证明自己正确更重要。
I believe that the IBM 2984 was designed for use with CICS, the Customer
，这一点在雷电模拟器官方版本下载中也有详细论述
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.
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The James Webb Space Telescope has snapped new pictures of a cosmic cloud of gas and dust blown off by a dying star, whose fate is still unknown to scientists.