underlie v.构成…的基础
例句：Introducing PPM in stages requires identifying and providing an order of importance, or value, to the needs which underlie the organization's desire to implement portfolio management practices.
句意：按阶段引入PPM要求识别并提供需求的重要性，或价值的顺序，这些需求是组织实现项目组合管理实践愿望的基础。