No jetlag: a positive benefit of polyphasic sleep is that it seems unlikely you'll have a problem with jetlag ever again.

没有时差：多相睡眠的一个好处是你不需要再担心飞机旅行的时差问题了。

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A net present value of greater than zero indicates that the project has positive net economic benefit to the company.

净现值大于零说明项目对公司有正的净经济效益。

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Adopting a positive perspective - rather than assuming the negative - during unclear social situations may be of especially good benefit to teens with anxiety.

在情况未明的社交情境中持一种积极的看法——而非消极想法——对于患焦虑症的青少年可能会很有帮助。

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The RBC analysts are already looking ahead to results from the current quarter, when potential factors like a global launch of the iPhone 5, international iPad sell-through, and an iPad HD launch could have a positive benefit.

FORBES: RBC Sees 'Solid' Earnings From Apple, Eyes Big Things Next Quarter

As the state spends less and does less - which would be happening whichever party was in government - there would be a positive benefit if some parts of society were to step forward and do more.

BBC: Prime Minister David Cameron defends Big Society policy

They recognise that this is a very small contribution to make which has a disproportionately positive benefit.

BBC: Gazan heads to Oxford University on unusual scholarship