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.
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.
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。
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