To find a high performance reduction algorithm is a focus point in the research on rough sets, but there doesn't exist an efficient method so far.

寻求一种高效的属性约简算法仍然是粗糙集的研究热点之一，现尚不存在一种非常有效的约简算法。

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The reduction in performance on these tasks associated with a 25-decibel hearing loss (classified as "mild") was equivalent to an ageing effect of seven years in cognitive abilities.

BBC: Viewpoint: Does deafness contribute to dementia?

"All other things being equal you will have a noticeable hard drive reduction in performance, " said Mr Burks, adding that, in some circumstances, it could make a drive 10% slower.

BBC: Hard drive evolution could hit Microsoft XP users

The latest ZiiLABS MandelMark data highlights how the increase in size of the StemCell array can result in a 2X increase in performance or a 50% reduction in power consumption.

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