Sometimes poor performance can be a result of a function being used more frequently than expected.

有时候，不必要地频繁调用一个函数会造成性能问题。

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New research suggests that for older women, living in a poor neighborhood is associated with lower cognitive function as compared to women who live in more affluent Settings.

一项新的研究显示，对于那些年长的女性来说，相比那些居住在比较富裕的社区环境里的女性而言，如果周围是比较贫穷的邻居，那么在这种环境下生活的女性认知功能会更加低下。

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In adolescents, poor sleep quality is associated with depression, anxiety, inattention, conduct problems, drug and alcohol abuse and impaired cognitive function.

在青少年中，不良的睡眠质量与抑郁，焦虑，注意力不集中，问题行为，毒品及酒精滥用以及认知功能受损等问题密切相关。

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And diabetes, depression and poor brain function have all been linked to missing restful hours in bed.

BBC: Poor sleep linked to heart failure, Norwegian study says

"Where we have seen certain bonds under-perform, it's normally a function of poor credit quality, weak structure or overly aggressive pricing, " he said.

WSJ: Perpetual Bond Risk Rises With US Treasury Yields

But he said the detrimental effect on cognition could be due to be attributable to poor heart and lung function affecting the brain, or directly harmful effects of smoking on brain - as well as lung - tissue.

BBC: NEWS | Health | Smoking 'is bad for your brain'