A ring represents a mapping between the names of entities stored on disk and their physical location.
环默示存储在硬盘上的实体名称和物理地位的映射。
According to this ring and mapping direction we classify the mapping transformation into two sorts: forward algorithm and reverse algorithm.
依据映射的变换方向不同，论文提出了非均匀映射实现的两类算法：正向算法与反向算法。
The properties of the homomorphic images of rough subrings and rough ideals are obtained by discussing the variation of approximation operators under homomorphic mapping in the ring.
对同态映射下环中近似集合的变化规律进行了讨论，得到了粗糙子环、粗糙理想同态象的若干性质。
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