It is a good idea to take a break every 15 minutes, when you are working at a computer or using a smartphone.

当你使用电脑或智能手机工作时，每15分钟休息一下是个好主意。

youdao

After spending hours working at a computer display, look at a blank piece of white paper.

在电脑显示器前工作数小时后再看一张白纸。

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So if like me you are working at a computer a lot then make sure there are is no unnecessary paperwork, magazines etc around you which could distract you.

比如说，你跟我一样，工作要时常用到电脑，那么身边一定不要有不必要的文书或杂志之类的东西，这样会分散你的注意力。

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"You think you've got your own computer all to yourself and you can't tell the difference that you're working on something other than a computer and sharing this other resource and doing it at a much lower cost than having your own PC."

VOA: special.2010.04.12

Peter Moore,a computer consultant, was working in Baghdad when he and four bodyguards were seized at the finance ministry in May 2007 by some 40 gunmen disguised as Iraqi police.

VOA: standard.2009.12.30

Mrs Esack was working on a computer at reception when Mr Esack arrived, "mumbled something" before lashing out with the knife.

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Carnahan said she had been working at her computer on a campaign speech she had been planning to deliver the next day for her husband when he called her, shortly before the crash.

CNN: In Missouri, Carnahan's widow vows to carry on husband's fight

Working on an iPad on my lap is a wholly different experience than working at my computer: It never felt like work.

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