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建立林业资源信息空间基底是为林业资源的属性信息提供空间数据，为GIS在林业方面的应用提供基础数据。
Building spacial fundus of forestry resources information can offer spacial data for attribute information of forestry resources and base data for GIS application in forestry.
若类别成员、方法、栏位、属性或事件是位于覆写基底类别虚拟成员的衍生类别上，则可宣告为密封。
A class member, method, field, property, or event, on a derived class that is overriding a virtual member of the base class can declare that member as sealed.
做为所有属性项目类别的基底类别。
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