Spatial data model is the core and base of three dimensional geographic information system design.
空间数据模型是地理信息系统设计的核心和基础。
Just saying the data base encryption is a safe information core problem.
也就是说数据库加密是信息安全的核心问题。
Just saying the data base encryption is a safe information core problem.
也就是说数据库加密是信息安全的核心问题。
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