求翻译：已有的研究表明目前还没有一种普适的理论与模型，因此研究者们企盼构建一种能完全捕捉和管理开发知识的工程活动本体去描述产品开发过程。是什么意思？

Existing research shows that there is no theory and model of a universal, so researchers hope can build a complete knowledge capture and management development project activities of ontology to describe the product development process.