Description logic is a formal language for representing knowledge and it is a decidable subset of first-order logic.

描逻辑是一种知识的形式化语言,是一阶逻辑的可判定子集。

To describe the anisotropy of microdamage of the crust block, we use the damage tensor that is expressed in the fissure density.

为描块体微损伤的各异性，引入裂纹密的损伤张量形式。