sub-space enhancement的用法和样例：
例句
- By decomposing the space of contact forces into four subspaces, a general formulation of contact forces is developed.
通过将接触力空间分解成四个子空间，给出了接触力的一般表达式。 - Based on methods of Density and Grid, this approach limits dense cells to the intersection of their sub-dimension dense cells, which shrinks the searched space.
该方法采用基于密度和基于网格的方法，将高维密集单元的搜索限制在子空间密集单元的交集中，缩小了搜索空间。
