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A highly duplicated index can severely impact the speed of accessing, updating and deleting data.

一个高度重复的索引可能会严重影响访问、更新和删除数据的速度。

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Speed, efficiency, and mobility: no doubt these words have had significant impact on all of our lives.

速度、效率、社会流动：毫无疑问这些词语对我们所有人的生活都有着深刻的影响。

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An accident investigator later examined the scene and estimated the speed at point of impact was between 30mph and 35mph which "must mean the approach speed would have been greater", said Mr Lamb.

BBC: Blackpool fatal crash driver 'used excessive speed'

And yet, most companies continue to underestimate the speed and impact of these changes.

BBC: Will digital addiction clinics be big in 2013?

An accident investigator later examined the scene and estimated the speed at point of impact with the tree was between 30mph and 35mph.

BBC: Naomi Jones cleared of causing death by dangerous driving