挖洞

The soldiers undermined the wall.

士兵们在墙下挖洞。

In addition,the paper proposes decision judgement theorem,decision discernment theorem, decision surplusage discarding theorem and hole digging principle on decision factors universe X .

文章提出具有中性域X(X≠{x})X的上的双枝模糊的概念和优化分析模型、理、识别理、去余理和因素域X上的挖洞原理。