很好，但是您对这种结构所能做的只是通过单独的(或者多维的)索引来设置和检索元素。

Good enough, but about all you can do with this structure is set and retrieve elements by individual (multi-dimensional) index. In contrast, a Numarray array is a bit more flexible.

youdao

这些多维的OLAP产品，即MOLAP产品，运行速度通常比其他方法更快，这是因为能直接把索引做进数据立方的结构，方便收集数据子集。

These multidimensional OLAP, or MOLAP, products typically run faster than other approaches, primarily because it's possible to index directly into the data cube's structure to collect subsets of data.

youdao