Computers can fulfill a useful function if used properly.

如果运用得当电脑能够起很大作用。

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Yes, it serves a useful function but is it the main way of shopping for travel?

的确，这是一项实用的功能，但这是旅游购买的主要方式吗？

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But according to new research from Cornell University, tipping no longer serves any useful function.

但据康奈尔大学新的调查结果，小费现已不再具有任何实用的功能。

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It turns out we can express all these functions in terms of G, G we wouldn't need to choose G, but it's a very useful function to choose.

最终我们能把所有的这些函数,用自由焓G表示出来，我们没有必要选择，但是这个选择很有用。

麻省理工公开课 - 热力学与动力学课程节选

Therefore, Wall Street performs no useful function in society and should be closed down.

FORBES: Moronic Study Forced Upon SEC By Dodd-Frank Yields Meaningless 212 Page Report

The daily also suggests that, as "Russia's financial kidney", the country's banking system also performs the useful function of dealing with money of dubious origin.

BBC: Russian press suspicious of Cyprus rescue plan

Males, known as drones, perform no useful function except to mate.

NEWYORKER: Stung