Adopting special technical treatment on lamps to guarantee UV depreciation less than 25% during the useful lifetime.

采用特有的处理技术，确保灯管在有效寿命期间的紫外线衰减小于25%。

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The worry is that corrosion induced by space weather may reduce the useful lifetime of the pipes, which in turn means they require early replacement.

另人担忧的是由空间天气引起的生锈会降低管道的使用寿命，这也意味着要提前更换。

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Formal documentation of system semantics (through modeling) will increase software quality and extend the useful lifetime of designs (thereby increasing ROI).

系统语义的正式文档(通过建模)将提高软件质量，延长设计的有效生命周期(从而提高roi)。

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Jennifer Bemisderfer says this involves thinking about a product's whole lifetime: "When those products are at the end of their useful life, how are they going to be broken down?

VOA: special.2010.01.26

In rigorous testing, the Energy Department said, the bulb had a useful lifetime of more than 25, 000 hours.

WSJ: The Digital Solution: The Brightest, Most Efficient Bulbs

Thus it might prove more expedient to invest in this at least tried technology, which could extend the useful lifetime of nuclear power by hundreds of years.

FORBES: Thorium Nuclear Power -- A Lesson From Norway

The Lifetime Learning credit is useful for grad school and night school tuition, and can be claimed over and over.

FORBES: Paying for College: Federal Tax Credits and Deductions