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Sigma KEE - UndergroundArea
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地下区域
The class of regions located Below the surface of the earth.
Relationships      
Parents 地理区域 A geographic location, generally having definite boundaries. Note that this differs from its immediate superclass Region in that a GeographicArea is a three-dimensional Region of the earth. Accordingly, all astronomical objects other than earth and all one-dimensional and two-dimensional Regions are not classed under GeographicArea.


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