By contrast, no-one CARES if an E-mail takes a few seconds longer to arrive-and it can therefore be allotted a lower quality of service.

相比而言，无人关心电邮是否晚了几秒到达——因此可派之以较低的服务质量。

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Network providers do not guarantee a certain quality of service, but merely promise to do their best. That may not matter for personal e-mails, but it does for time-sensitive data such as video.

网络提供者们不担保某种程度的服务质量，仅承诺将尽力而为，这可能对个人电邮不算什么，但是对时间敏感的数据比如视频就很重要了。

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Some problems about service quality and service performance, e. g. communication, responsibility period and service redirection, are also discussed in this paper.

本文还讨论了服务调用过程中的通信方式、响应时间、服务重定向等涉及到服务质量和服务性能的一些问题。

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In the week after the e-mail, sales doubled as customers who had long appreciated the quality of service and the pizza, upped their orders to keep their favourite restaurant alive.

ECONOMIST: Starting out