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The ellipsoid model is the first part of a spatial reference system definition.
椭圆体模型是空间引用系统定义的第一部分。
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According to this definition, a model is a description of a system.
按照这个定义，模型是关于系统的描述。
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According to this definition, a model is a description of a system.
按照这个定义，模型是关于系统的描述。
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