Automatic allocation of secondary partition header pages for extending the extent map.
用于扩展区段映射的二级分区头文件页的自动分配。
The Informix 11.70 introduces extent map overflow pages so the maximum number of extents is high (32,767); however, using extent map overflow pages reduces efficiency.
Informix 11.70引入了区段溢出页，因此区段的最大数量值很高（32,767）；然而，采用区段映射溢出页会导致效率降低。
But this is the first map to address the thickness of the ice as well as its extent.
但是这次是第一幅既有范围，又有厚度的地图。
Since the number of levels remains the same regardless of the map extent, map tiles can be cached by the browser in multiple levels.
因为级别的数量仍然保持一致而不用管地图的现实范围，地图瓦片可以被浏览器在多级别的情况下进行缓存。
The map resource item uses this information along with the Map control extent to determine which cache tiles need to be retrieved.
地图资源项使用这个信息和地图控件的显示范围来决定哪一个缓存瓦片需要重新获取。
Flood risk map reflect the different frequency flood and the scope and extent of a region likely to be flooded.
洪水风险图是反映不同频率的洪水发生时，某一区域可能遭受洪水淹没的范围和程度的地图。
The printed map will have the same centre and vertical field of view as the screen map, but its "horizontal" extent will depend on the shape of the paper.
打印的星图与显示器上的有着相同的中心与垂直天区，但是水平跨度将取决于所用纸张的尺寸。
The printed map will have the same centre and vertical field of view as the screen map, but its "horizontal" extent will depend on the shape of the paper.
打印的星图与显示器上的有着相同的中心与垂直天区，但是水平跨度将取决于所用纸张的尺寸。
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