结合网格索引和R树索引的特点，提出了一种基于网格与R树的多级混合索引。
According to the characteristics of spatial index of grids and R-tree, a hybrid structure of spatial multilevel index is presented based on grid and R-tree.
通过实际构建系统，探讨了基于混合索引的中文全文检索系统的实现。图3。表4。参考文献5。
By actual examples, the authors discuss the realization of a Chinese full-text retrieval system based on mixed indexing. 3 figs. 4 tabs. 5 refs.
更好的控制手工索引和索引编写（RAM使用、非混合的文件格式标志等等）。
Better control over manual indexing and index writing (RAM consumption, non-compound file format flag etc).
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