目前，美国注册游艇约为1167万艘，年新增约30万艘，其中80%为入门级产品，价格仅数万美元。欧洲则在高端超级游艇领域占据全球主导地位，形成“大众入门+中端休闲+顶级奢华”的分层市场结构。需求基础广泛，因此抗周期能力强。
prevFleetTime = currentTime; // 更新上一个车队的时间为当前时间
Quadtrees are everywhere spatial data exists. Mapping services use quadtree-like tile pyramids to serve map tiles at different zoom levels (Bing's quadkey system, for example, addresses tiles as base-4 paths). Game engines use them for collision detection and visibility culling. Geographic information systems use spatial indexes to store and query spatial datasets. PostGIS uses GiST indexes (R-tree-style) for spatial queries on geometries, while PostgreSQL's core supports quadtree-like SP-GiST indexes for certain data types like points.，推荐阅读搜狗输入法下载获取更多信息
Москвичи пожаловались на зловонную квартиру-свалку с телами животных и тараканами18:04
，这一点在WPS下载最新地址中也有详细论述
FirstFT: the day's biggest stories
* @param arr 数组，详情可参考爱思助手下载最新版本