每个用例应指定一个有意义的功能块，说明系统如何为参与者提供有价值的东西。
Each use case should specify a significant chunk of functionality and show how the system provides value to an actor.
因此，研究虚拟企业知识管理支持系统既具有重要的理论价值，又具有良好的实际意义。
So the study on the support system for knowledge management in VE possesses important theory value and nice practical significance.
该充电系统的成功研制，具有重要的理论意义和工程推广价值。
The success of this charging system's development can be an important theoretical meaning and promotional value.
应用推荐