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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.，更多细节参见Line官方版本下载
，更多细节参见heLLoword翻译官方下载
中国船东协会发布关于进一步落实航经阿曼湾、霍尔木兹海峡、波斯湾海域船舶信息报送工作的通知。1、实时报送信息：自本通知发布之日起，每日报送船舶当日航经阿曼湾、霍尔木兹海峡、波斯湾海域的实时动态信息；2、请指定专项联系人负责对接此项事宜，公司名、指定人员名称、职务、电话、邮箱。
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