This paper analyses the average communication delay of circuit-switching, message switching, packet-switching, virtual cut-through and direct-passing and, the average response time of direct-passing.

对线路交换、消息交换、包交换，虚拟旁通和直通的平均通信延迟时间以及直通的平均请求响应时间进有了分析。

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Players pay for play time or virtual goods within the games, and the social networks take a cut of the sales.

玩家需要为游戏时间或游戏里的虚拟商品付费，社交网络公司则从销售额中提成。

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But if the tablet is going to serve as an alternative to a notebook or netbook, an ordinary virtual QWERTY isn't going to cut it.

但是如果平板想作为笔记本和上网本的替代品，一个普通的虚拟QWERTY键盘不足以达到这个目的。

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While the virtual machines cut costs and save energy, they also raise questions about data leakage as well as whether a customer would ever find out files have been breached, said Jim Reavis, executive director of Cloud Security Alliance, a non-profit advocated for cloud security standards.

CNN: How safe is cloud computing?

And though Facebook takes a cut of the virtual currency pie, Credits evangelists like CrowdStar say that using the unified virtual currency system has translated into increased overall sales.

FORBES: Facebook's One Bling To Rule Them All: 5-Year Credits Deal With CrowdStar

Creating clear-cut rules for virtual currencies is difficult.

WSJ: Bitcoin Virtual Cash Gets Money-Laundering Rule