Thirdly, the conceptual model of map database and administrative mode of map complex object are designed.

第三，设计了地图数据库的概念模型和地图复杂对象管理模式；

youdao

Thirdly, the conceptual model of map database and administrative mode of map complex object are designed.

第三，设计了地图数据库的概念模型和地图复杂对象管理模式；

youdao