combinatorial theory

例句：

1. 1.The combinatorial theory of percolation has been a subject of intense interest for decades.
   组合论理论在渗流问题上一直是几十年来研究的热点。
2. 2. In combinatorial theory, the problem of finding all possible subsets is known as the NP-complete problem.
   在组合论中，寻找所有可能的子集的问题被称为NP完全问题。
3. 3. The combinatorial theory behind this algorithm provides a mathematical framework for understanding how to solve complex optimization problems.
   这个算法背后的组合论为理解如何解决复杂的优化问题提供了一个数学框架。