It seems we're always going back and forth on the subject of Facebook's usefulness at work.

我们似乎总是在Facebook的工作实用性这一话题上徘徊。

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Several library applications, including federated search, work with toolbars to enhance their usefulness further.

一些包含了联邦检索的图书馆应用程序，和工具栏一起加强了他们的应用深度。

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This paper contains the stronger practicability, system, usefulness and maneuverability, will have the aggressive push function for the high school stability work in lately period.

本文具有较强的实用性、系统性、有效性与可操作性，对于做好新时期的高校稳定工作必将起到积极的推动作用。

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That lack of trust significantly diminishes its usefulness as a work companion, but I have few complaints about the Prime as a purely recreational device.

ENGADGET: IRL: ASUS Transformer Prime, Verbatim Dual USB Power Pack and V-Moda's Crossfade LP headphones

For virtual worlds to be able to extend this usefulness to the mass of people a lot of work has yet to be done, said Mr Rosedale.

BBC: NEWS | Technology | A very real future for virtual worlds

Mr. SYKES: Yeah, there will probably always be, you know, a minority, and perhaps the result would be that there is no single definition that everybody would agree on as having general usefulness that there would be one definition for one type of work, another definition for another type of work.

NPR: Astronomers Prepare to Fight Pluto Demotion