系统功能结构划分为三层：核心功能层，会务管理层和网络管理层。
The functional structure of system is divided into key function layer, conference affair management layer and the network management layer.
实际情况是，3gl团队必须非常专业并专注应用程序的这些基础层，他们交付核心功能的能力可能会受到损害。
The reality is that 3gl teams must be so specialized and focused on these foundation layers of the application that their ability to deliver core functionality can be compromised.
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