一或多个核心系统的“新”“旧”版本可能同时存在以服务于不同的应用程序，以及不同的中间层服务。
There could also be "old" and "new" versions of one or more core systems in place to serve these different applications, along with different mid-tier services.
安装程序将在簇的第二级节点上安装所需的核心系统文件。
Setup will install a set of core system files required on the secondary node of a cluster.
文章介绍了一种面向应急救援的呼叫中心系统，其核心软件基于有限状态机理论设计而成，具有控制结构清晰、程序代码简洁高效等特点。
This paper presents an emergency call center system. The kernel software of the system is designed based on a finite-state machine, featuring with clear control structure effective program code.
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