当您制定一个匿名的的联合体时，这个属性可以被设定为True。

This property can be set to True when you have to make a union anonymous.

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GIS地理信息是空间属性与描述同性的结合体。

GIS is the combination of the space and the same description.

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GIS地理信息是空间属性与描述同性的结合体。

GIS is the combination of the space and the same description.

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