The objectid column is there to support some GIS and map viewer software, including the ArcExplorer program that is available for free download from IBM (see Resources).
这里的objectid列用来支持某些GIS和地图查看软件，包括ArcExplorer程序(可以从IBM免费下载，参见参考资料)。
The objectid column is there to support some GIS and map viewer software, including the ArcExplorer program that is available for free download from IBM (see Resources).
这里的objectid列用来支持某些GIS和地图查看软件，包括ArcExplorer程序(可以从IBM免费下载，参见参考资料)。
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