当模型从要包括空间数据供给者和空间效劳供给者两个角色。

This model mainly includes two basic roles: spatial data provider and spatial service provider.

youdao

当模型从要包括空间数据供给者和空间效劳供给者两个角色。

This model mainly includes two basic roles: spatial data provider and spatial service provider.

youdao