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。

youdao

Looking forward, beyond the 2.1.x line, Hades will become part of the Spring data project where it's core will serve as a base for repository implementations for other datastores as well.

展望未来，2.1 . x版本之后，Hades可能会成为Spring Data项目的一部分，其核心将作为实现其它数据存储资源库的实现基础。

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But because standards serve as a core source that is distributed across many instances, you might face challenges when you need to update a standard.

但由于标准作为核心资源被分布到多个实例中，因此当需要更新一个标准时，您可能会面临一些困难。

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Currencies at their core serve an essential market purpose for placing money values on profits and investments.

FORBES: Magazine Article

The best way to get started is with a good all-purpose international fund or ETF that can serve as your core international holding.

FORBES: Creating A Borderless Portfolio

Jewell called those steps essential in order to maintain the department's core mission to serve the public.

NPR: Furlough Friday: Unpaid Day Off For Many In Gov't