Providing the quality literature information environment is the key of guaranteeing the quality of information service.

提供优质的文献信息环境，是保证信息服务质量的关键。

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Peer to server and peer(P2SP) mode combines the technical advantages of both C/S and P2P, and can not only improve the quality of information service but also control the cost of the sys-tem.

对等服务器网络（P2SP）模式融合了C/S和P2P两者的技术优势，可以提高信息服务的质量，同时控制系统的成本。

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In contrast, a system may require identifying information in order to handle matters such as security or quality of service.

相比而言，为了处理诸如安全或服务质量之类的事情，系统就需要标识信息了。

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Dr. S. Robert Lichter is Professor of Communications at George Mason University, where he also directs the Center for Media and Public Affairs, which conducts scientific studies of the news and entertainment media, and the Statistical Assessment Service (STATS), which works to improve the quality of statistical and scientific information in the news.

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