In this paper, one new data transport technology named Resilient Packet Ring (RPR) in metropolitan area networks is discussed and anayzed in a great extend.

本文主要是对城域网中一种新型的数据传输技术—弹性分组环（RPR），进行了详细地探讨和深入地研究。

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SHAONET, the first WDM all optical network testbed in China, is a metropolitan self-healing ring. A novel OADM having protection function is adopted.

SHAONET是国内自主开发的第一个WDM全光试验网平台，它采用了一种新型保护结构的OADM，具有很强的自愈功能。

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Imagine how much the Metropolitan Opera could have saved on its gigantic Ring Cycle if it had forgone the Robert Lepage "machine" and done it all with video.

WSJ: Still Searching for the Promised Land | Moses in Egypt | New York City Opera | Opera Review by Heidi Waleson

The Metropolitan Police said Wyn-Davies was the leader of the ring.

BBC: Paedophile ring members jailed indefinitely