后面用两个章节详细介绍了需求审批工作流子系统和需求综合查询子系统的设计与实现。
The last two chapters describe the design and implementation of the requirements approval workflow subsystem and integrated query subsystem in detail.
在本文中，详细讨论和叙述了该系统中需求审批工作流子系统以及综合查询子系统的设计与实现。
This article discusses and describes in detail the design and implementation of the requirements approval workflow subsystem and integrated query subsystem.
事件——应用程序管理与外部及子系统间的事件流。
Events — an application manages the flow of events to and from the outside world and among subsystems.
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