Most Windows PCs will exhibit a certain degree of slowness after some period of usage (about 2 years or so).

大多数Windows电脑将展出经过一段时期的使用(约2年左右)一定程度的缓慢。

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The volume table for oil storage tank will lose efficacy after a period of usage due to factors like foundation deformation.

由于地基变形等原因，地下储油罐使用一段时间后罐体的变位会导致原标定的罐容表失效。

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In early period, there were no half-measures: usage was either right or wrong, and it was the task of the grammarian not simply to record alternatives, but to pronounce judgement upon them.

在早期，没有折中办法：（语法）用法不是对就是错，并且语法学家的任务不是简单地记录备选词，而是对它们作出判断。

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While Earth-Policy says that hybrids could slash U.S. gasoline use in half, it also points out that the same usage of plug-in hybrids over the same period of time could result in gasoline usage being cut by 70 percent.

CNN: All About: hybrid transportation

" Moving on, you'll also see that exceeding 5GB of usage during any single billing period gives Verizon the right to "reduce throughput speeds of any application that would otherwise exceed such speed to a maximum of approximately 200Kbps.

ENGADGET: Verizon updates T&Cs to further redefine "unlimited" data usage

We expect DVDs mailed per subscriber to decline to about 5 per month by the end of Trefis forecast period as a result of (i) the on-going shift to lower cost plans (ii) increasing usage of streamed TV shows and films as a substitute for mailed DVDs.

FORBES: Headwinds for Almighty Netflix