Though coating paint had been used to prevent the corrosion, the period of maintenance only lasted 3-4 years.

虽然采用了涂料保护，闸门的检修保养期也只有3 ~ 4年。

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This led to new software being developed on multiple platforms leaving, for a time, the tried-and-true mainframe applications in a state of maintenance only.

这一度导致大量的软件开发在多种平台上，而经过检验且可靠的主机软件仅处于维护状态。

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AESA's open systems architecture incorporates commercial off-the-shelf components and is anticipated to be more affordable and require maintenance only every 10 to 20 years.

AESA的开放式系统架构合并了商业现货的组成部分，更具经济可承受性，每隔10年到20年才需进行维护。

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And with sea levels due to rise in the next century by half a metre in some places, maintenance can only get costlier.

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The thrill-ride expert says that during the recent recession, theme parks around the world went into maintenance-only modes in order to reduce operating costs.

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Before BMW offered the free maintenance program, only about 42% of customers got service at the dealership.

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