求翻译：本体的目的是捕获相关领域的知识，提供对该领域知识的共同理解，确定该领域内共同认可的概念，并从不同层次的形式化模式上给出这些概念以及概念间相互关系的明确定义，因此，概念集的定义是本体建模的关键环节[7,8]。是什么意思？

Ontology is designed to capture knowledge in related fields, provide a common understanding of knowledge in the field, determining shared concepts in the field, from formal models of different levels and give a clear definition of these concepts and the relationships between concepts and, therefore, ontology modeling is the definition of the concept set key [7,8].