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.
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。爱思助手下载最新版本对此有专业解读
Steven Vaughan-Nichols, Senior Contributing EditorSenior Contributing Editor
但另一款Galaxy Fold(可折叠一次而非两次)肯定会于今年夏天推出。崔元俊谈到了三星推出其书本式折叠屏手机的更宽屏版本的可能性，该版本可能以更低的价格实现TriFold的某些娱乐功能。
这种消费心理的差异，本质上是为过程付费与为结果买单的区别。欧美游客愿意为船上的时间付钱，而中国游客更倾向于为下了船看到了什么而付钱。