substantivity

例句：

1. 1. The concept of substantivity is central to the study of economics.
   实质概念是经济学研究的核心。
2. 2. The scientist's research has provided new insights into the substantivity of matter.
   科学家的研究为物质的实质提供了新的见解。
3. 3. The debate over the substantivity of human rights has been ongoing for decades.
   关于人权实质的争论已经持续了几十年。