You may recall that retrieving and persisting ACL bitmaps was an initial maintenance and database portability concern.

您可能记得，检索和保持acl位图是考虑到初始的维护和数据库可移植性。

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This article incorporates all the tech talk; the next two articles will focus on the business; first, for the initial services and then for the maintenance and exploitation of those services.

这篇文章概括了所有的技术讨论，接下来的两篇文章将集中讨论业务，首先讨论最初的服务，然后讨论那些服务的维护和扩展。

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Costs for such environments include the purchase price and maintenance for the operating system, initial outlays and upgrades for hardware, and other administration expenditures.

这种环境的花销包括购买和维护操作系统的费用、购买和升级硬件的花费以及管理支出。

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In that case, Windows PC has lower initial purchase costs and the overall maintenance cost.

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Also, considering the speed of evolution of mobile device features and operating systems, evolving field requirements, ongoing maintenance of multiple platforms can cost multiple times the initial development budget over a five-year period.

FORBES: A Five-Point Checklist For CIOs Looking For A Mobile App